Calculators

Browse and search over 250 evidence-based medical calculators.

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A

A-a Gradient Calculates difference between alveolar and arterial oxygen concentration.
ABCD2 Score to Predict Stroke Risk after TIA Estimates the risk of stroke following transient ischemic attack.
Absolute Eosinophil Count Assesses number of eosinophils (e.g., in people with allergic or autoimmune conditions, or parasite infections).
Absolute Lymphocyte Count Estimates number of lymphocytes and predicts CD4 count.
Absolute Neutrophil Count Measures number of neutrophils (used to asses neutropenia or neutrophilia).
Absolute Reticulocyte Count Measures reticulocytes (used to assess anemia).
Acetaminophen (Paracetamol) Toxicity Assessment (Original, 1975) Calculator to guide management following a single acetaminophen (paracetamol) ingestion, based on time since ingestion and blood acetaminophen level, using the original 1975 Rumack and Matthew calculation.
Acetaminophen (Paracetamol) Toxicity Assessment (Revised 2023) Calculator to guide management following a single acetaminophen (paracetamol) ingestion, based on time since ingestion and blood acetaminophen level, using the 2023 revision of the Rumack and Matthew calculation.
ACR/EULAR Rheumatoid Arthritis Diagnostic Criteria (2010) Diagnostic criteria for rheumatoid arthritis.
Acute Heart Failure Prediction Based on NT-proBNP and Clinical Features Estimates risk of acute heart failure.
Alcohol Consumption Screening AUDIT Questionnaire Screening tool to identify alcohol use disorders.
Aminoglycoside Clearance Estimate Estimates rate of aminoglycoside clearance.
Anion Gap Aids in identifying causes of metabolic acidosis.
Anion Gap Delta Delta Gradient Multicalc Aids in identifying acid-base disorders.
Anion Gap Delta Delta Ratio Multicalc Aids in identifying acid-base disorders.
Anion Gap in Hypoalbumin States Calculation of anion gap (to identify acid-base disorders) taking hypoalbuminemia into account.
APACHE II scoring system Estimates ICU mortality.
Apgar score Assesses neonates 1 and 5 minutes after birth.
Arterial Blood Gas Interpretation TreeCalc Analysis of arterial blood gas results.
Atrial fibrillation CHADS(2) score for stroke risk Estimates risk of stroke in patients with atrial fibrillation.

B

BAP-65 prediction of in-hospital mortality and need for mechanical ventilation in COPD Predicts risk of mortality and need for mechanical ventilation in acute exacerbations of COPD.
Base Excess Determination Aids in identifying acid-base disorders.
Bayesian Statistics I MultiCalc Calculates statistics from prevalence, sensitivity, and specificity.
Bayesian Statistics II MultiCalc Calculates statistics from true and false positives and negatives.
Bedside Index of Severity in Acute Pancreatitis (BISAP) Score Predicts risk of mortality in acute pancreatitis.
Benefit Increase / Number Needed to Treat Multicalc Calculates absolute and relative benefit and number needed to treat.
Bicarbonate Deficit Calculates total bicarbonate deficit.
Blatchford score for gastrointestinal bleeding Stratifies patients with upper GI bleed, identifying those who can be safely treated as outpatients.
Bleeding Risk (any bleeding complication) on Warfarin Therapy Estimates risk of any bleeding complications for patients on warfarin.
Bleeding Risk (major complication) on Warfarin Therapy Estimates risk of major bleeding complications for patients on warfarin.
Bleeding Risk Index for Warfarin Therapy Estimates risk of bleeding for patients on warfarin.
Blood Ethanol Concentration Estimation Estimates blood ethanol concentration.
BODE Index for COPD Survival Prediction Estimates prognosis in patients with COPD based on body mass index, airflow obstruction, dyspnea, and exercise.
Body Mass Index (BMI) (Quetelet's index) Assesses whether patient is at a weight appropriate for their height.
Body Mass Index (BMI) percentiles for boys (2 to 20 years) Assesses whether patient is at a weight appropriate for their height, age, and gender.
Body Mass Index (BMI) percentiles for girls (2 to 20 years) Assesses whether patient is at a weight appropriate for their height, age, and gender.
Body Surface Area (Du Bois Method) Calculation of body surface area.
Body Surface Area (Gehan & George Method) Calculation of body surface area.
Body Surface Area (Mosteller, square root method) Calculation of body surface area.
Body Surface Area Based Dosing Calculates drug dose based on body surface area.
Breast Cancer Recurrence Risk After Mastectomy (simple) Assesses risk of breast cancer recurrence after mastectomy based on tumor grade and lymphatic involvement.
Breast cancer risk assessment by Gail Model (2018) Screening tool which allows health professionals to estimate a woman's risk of developing invasive breast cancer over the next five years and up to age 90 (lifetime risk).
Burn Injury Fluid Resuscitation (Brooke estimate) Estimates fluid requirements following burn injury.
Burn Injury Fluid Resuscitation (Demling dextran estimate) Estimates colloid fluid requirements following burn injury.
Burn Injury Fluid Resuscitation (Evans estimate) Estimates fluid requirements following burn injury.
Burn Injury Fluid Resuscitation (Modified Brooke crystalloid estimate) Estimates fluid requirements following burn injury.
Burn Injury Fluid Resuscitation (Slater estimate) Estimates fluid requirements following burn injury.
Burn Injury Fluid Resuscitation, Adult (Parkland crystalloid estimate) Often used to estimate fluid requirements in adults following major burn injury.

C

Calcium Correction in Hypoalbuminemia Calculates corrected calcium level for patients with hypoalbuminemia.
Calcium Correction in Hypoalbuminemia (SI units) Calculates corrected calcium level for patients with hypoalbuminemia.
Canadian Head CT Rule for Minor Head Injury Assesses which patients with minor head injury need CT scan.
Cardiac output Calculates cardiac output.
Cardiac Risk Index for Non-AAA Vascular Surgery (Lee) Estimates risk of cardiac complications following vascular surgery (non-abdominal aortic aneurysm).
Cardiac Risk Index for Orthopedic Surgery (Lee) Estimates risk of cardiac complications following orthopedic surgery.
Cardiac Risk Index in Noncardiac Surgery (Detsky et. al.) Estimates risk of cardiac complications following noncardiac surgery.
Cardiac Risk Index in Noncardiac Surgery (Goldman, et. al.) Estimates risk of cardiac complications following noncardiac surgery.
Cardiovascular Risk Assessment (10-year, ACC/AHA 2013) Estimates 10-year risk of cardiovascular disease based on key risk factors.
Cardiovascular risk assessment (10-year, MESA 2015, with or without CAC score) Ten-year cardiovascular risk assessment with or without coronary artery calcification score.
Cardiovascular Risk Assessment (10-year, PROCAM Score, Munster Heart Study SI units) Ten-year cardiovascular risk score based on Munster study with cholesterol levels in SI units.
Cardiovascular Risk Assessment (10-year, PROCAM Score, Munster Heart Study) Ten-year cardiovascular risk score based on Munster study with cholesterol levels in mg/dL.
Cardiovascular Risk Assessment in Men (10-year, patient information, Framingham 2008) Cardiovascular risk score that includes patient information for men.
Cardiovascular Risk Assessment in Men (10-year, Reynolds Risk Score 2008) Ten-year cardiovascular risk score that includes C-reactive protein as well as other criteria.
Cardiovascular Risk Assessment in Type I Diabetes (5-year) Estimates 5-year risk of cardiovascular disease in patients with type I diabetes.
Cardiovascular Risk Assessment in Women (10-year, patient information, Framingham 2008) Cardiovascular risk score that includes patient information for women.
CDC height for age percentiles for boys (2 to 20 years) Assesses whether patient is at appropriate height for their age.
CDC height for age percentiles for girls (2 to 20 years) Assesses whether patient is at appropriate height for their age.
CDC/NCHS Infant Head Circumference for Age Percentiles (<36 months) Assesses whether patient has appropriate head circumference for their age.
CHADS-VASc Score for Stroke Risk in Arial Fibrillation (CHA[2]S[2]-VASc) Score for stroke risk in atrial fibrillation.
Child Pugh classification for severity of liver disease Assesses severity of liver disease.
Child Pugh classification for severity of liver disease (SI units) Assesses severity of liver disease.
Cirrhosis probability in hepatitis C (FIB-4) Calculates FIB-4 index which is a non-invasive method of screening for clinically significant hepatic fibrosis secondary to metabolic dysfunction-associated steatotic liver disease (MASLD)
CIWA-Ar Clinical Institute Withdrawal Assessment for Alcohol scale Measures severity of alcohol withdrawal syndrome.
Clinical Grading to Predict Malignant Hyperthermia Historical, clinical and laboratory features to assess malignant hyperthermia.
Clinical Pulmonary Infection Score (CPIS) Aids in early diagnosis and treatment of ventilator-associated pneumonia.
Cognitive Impairment Screening with 6 Questions Screening tool for cognitive impairment in adults.
Community-acquired pneumonia severity index (PSI) for adults Estimates risk of mortality in patients with community-acquired pneumonia.
Conventional unit to SI unit conversions: Chemistry tests Unit conversions for chemistries.
Conventional unit to SI unit conversions: Immunology test values Unit conversions for immunology tests.
Creatinine clearance (measured) Measures creatinine clearance.
Creatinine clearance estimate by Cockcroft-Gault equation Calculates creatinine clearance according to the Cockcroft-Gault equation.
Creatinine clearance estimate by Cockcroft-Gault equation (SI units) Calculates creatinine clearance according to the Cockcroft-Gault equation.
Crohn's Disease Activity Index (CDAI) Assesses severity of Crohn disease.
CURB-65 pneumonia severity score Predicts risk of mortality in community-acquired pneumonia.

D

Depression (any) Screening by a Two Item PHQ-2 Scores for likelihood of any depression.
Depression (major) Screening by a Two Item PHQ-2 Scores for likelihood of major depression.
Dynamic International Prognostic Scoring System-Plus (DIPSS-Plus) Assesses risk and prognosis in primary myelofibrosis.

E

Edinburgh Postnatal Depression Scale (EPDS) Screening tool to identify women who may have postnatal depression.
Endocarditis Diagnostic Criteria -- Duke Criteria Pathological and major/minor clinical criteria for endocarditis.
Endocarditis Diagnostic Criteria -- Modified Duke Criteria Updated clinicopathological criteria for endocarditis.
Epworth Sleepiness Scale (ESS) Measures daytime sleepiness.
Estimated Date of Delivery (EDD) Calculates gestational age and estimated date of delivery.
Estimated date of delivery (EDD) (Patient education) Calculates gestational age and estimated date of delivery.
EuroSCORE for Cardiac Surgery Risk Assessment (additive version) Calculates risk of mortality in patients undergoing cardiac surgery.
EUTOS long-term survival (ELTS) score Estimates risk of chronic myeloid leukaemia-related death

F

Fall Risk in Elderly Hospitalized Patients Estimates risk of fall in elderly patients.
Fractional Excretion of Magnesium Calculates fractional excretion of magnesium (used to assess hypomagnesemia).
Fractional Excretion of Magnesium (SI units) Calculates fractional excretion of magnesium (used to assess hypomagnesemia).
Fractional Excretion of Sodium Calculates fractional excretion of sodium, helping to assess acute kidney injury.
Fractional Excretion of Sodium (SI units) Calculates fractional excretion of sodium, helping to assess acute kidney injury.
Fracture Index WITH known Bone Mineral Density (BMD) Calculates risk of fracture based on factors including bone mineral density.
Fracture Index WITHOUT known Bone Mineral Density (BMD) Calculates risk of fracture based on factors not including bone mineral density.
Friedewald Equation for Low Density Lipoprotein (LDL-C) Estimates concentration of LDL-C in plasma.
Friedewald Equation for Low Density Lipoprotein (LDL-C, SI units) Estimates concentration of LDL-C in plasma.
Functional Residual Capacity Calculates functional residual capacity from sum of expiratory reserve and residual volume.

G

GAD-7 Generalized Anxiety Disorder Scale Screening tool to identify people who may have generalised anxiety disorder (GAD).
Genetically Inspired International Prognostic Scoring System (GIPSS) Assesses risk and prognosis in myelofibrosis (includes genetic mutations).
Geriatric Depression 1 Item Screener Assesses likelihood of depression in elderly patients, based on 1 question.
Geriatric Depression 4 Item Scale Assesses likelihood of depression in elderly patients, based on 4 questions.
Geriatric Depression Scale Assesses likelihood of depression in elderly patients.
Geriatric Depression Scale (30-item GDS) Screening tool designed to identify symptoms of depression in older adults.
Geriatric-Sensitive Perioperative Cardiac Risk Index (GSCRI) This calculator estimates the rate of perioperative myocardial infarction or cardiac arrest (MICA) in patients ≥65 years old.
Gestational Age from Estimated Date of Delivery (EDD) Calculates gestational age based on estimated date of delivery.
Glasgow Alcoholic Hepatitis Score Estimates mortality risk in patients with alcoholic hepatitis.
Glasgow Blatchford Score for Gastrointestinal Bleeding Stratifies patients with upper GI bleed, identifying those who can be safely treated as outpatients.
Glasgow Coma Scale Assessment of conscious level based on eye, verbal, and motor responses to stimuli.
Glomerular Filtration Rate Estimate by CKD-EPI Equation Estimates glomerular filtration rate based on creatinine and patient characteristics.
Glomerular Filtration Rate Estimate by Quadratic Equation Estimates glomerular filtration rate based on creatinine and patient characteristics.
Glomerular Filtration Rate Estimate by Schwartz Formula Estimates glomerular filtration rate in children based on creatinine and patient's height.
Glomerular Filtration Rate Estimate by the Abbreviated MDRD Study Equation Estimates glomerular filtration rate based on creatinine and patient characteristics.
Glomerular Filtration Rate Estimate by the Abbreviated MDRD Study Equation (SI units) Estimates glomerular filtration rate based on creatinine and patient characteristics.
Glomerular Filtration Rate Estimate by the IDMS-Traceable MDRD Study Equation Estimates glomerular filtration rate based on creatinine and patient characteristics.
Glomerular Filtration Rate Estimate by the MDRD Equation Estimates glomerular filtration rate based on creatinine and patient characteristics.
Glomerular Filtration Rate Estimate by the MDRD Equation (SI units) Estimates glomerular filtration rate based on creatinine and patient characteristics.
Glomerular Filtration Rate Estimate by Updated Schwartz Formula Estimates glomerular filtration rate in children based on creatinine and patient's height.
Glomerular Filtration Rate Estimate in African Americans by AASK Equation Estimates glomerular filtration rate based on creatinine and patient's age and gender.
Glomerular Filtration Rate Estimation (eGFR) by Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) Equation with Creatinine, without Race (2021) Estimates glomerular filtration rate based on creatinine and patient characteristics without a race variable.
Glomerular Filtration Rate Estimation (eGFR) by CKD-EPI Equation with Creatinine and Cystatin C, without Race (2021) Estimates glomerular filtration rate based on creatinine, cystatin C and patient characteristics without a race variable.
Glomerular Filtration Rate Estimation (eGFR) by CKD-EPI Equation with Cystatin C, without Race (2012) Estimates glomerular filtration rate based on cystatin C and patient characteristics without a race variable.
Glomerular filtration rate estimation (eGFR) by CKiD U25 equations with creatinine and/or cystatin C in children and adults ≤25 years old Estimates glomerular filtration rate based on creatinine, cystatin C and patient characteristics in children and adults ages ≤25 years.
GRACE Score for Acute Coronary Syndrome Prognosis Estimates mortality risk for patients with acute coronary syndrome.

H

Harvey-Bradshaw Index of Crohn's Disease Activity Assessment of Crohn's disease activity including extraintestinal features.
HAS-BLED Bleeding Risk Score Estimates risk of major bleeding for patients with atrial fibrillation on oral anticoagulation.
Heart Failure Diagnosis Clinical criteria for diagnosis of heart failure.
HEART Score Incorporates elements of the patient's history, ECG, age, risk factors, and troponin and is used for patients in the accident and emergency department setting to assess risk of acute MI, PCI, CABG, and death within 6 weeks of initial presentation
Hepatitis C Outcome TreeCalc Assesses risk of death, hepatocellular carcinoma, or liver transplantation in patients with hepatitis C.
Hepatitis Discriminant Function for Corticosteroid Therapy in Alcoholic Hepatitis Score parameters including prothrombin time and bilirubin level.
HOMA Formula: Homeostasis Model Assessment of Insulin Resistance Estimates severity of insulin resistance.

I

In-Flight PaO2 Estimation Predicts patient's PaO2 during flight.
In-Flight PaO2 Estimation (using PFT's) Predicts patient's PaO2 during flight.
Injury Severity Score (ISS) Assesses severity of traumatic injury.
International Prognostic Index for Non-Hodgkin Lymphoma Prognostic score including age and stage.
International Prognostic Score in Hodgkin Lymphoma Estimates freedom from progression and overall survival in patients with Hodgkin lymphoma.
International Prognostic Score in Hodgkin Lymphoma (2012 update) Prognostic score including stage and laboratory features.
Intracranial Bleeding Risk from Thrombolytic Therapy of MI Estimates risk of cerebral bleeding in patients treated with thrombolytic therapy for mycocardial infarction.
Irritable Bowel Syndrome Diagnostic Criteria (Manning Criteria) Diagnostic criteria for irritable bowel syndrome.

J

Jones Criteria for Diagnosis of Rheumatic Fever Diagnostic criteria for rheumatic fever.

K

Karnofsky Performance Status Score Assesses patient for functional impairment.
Kawasaki Disease Diagnostic Criteria Diagnostic criteria for Kawasaki disease.
Kidney Failure Risk (KFRE) (8 variable) Estimates risk of kidney failure incorporating coefficients representative of the North American cohort in Tangri et al (2016). Urine albumin to creatinine ratio expressed in mg/g.
Kt/V Dialysis Dose Daugirdas Formula Quantifies adequacy of dialysis treatment.

L

LACE Score Predicting Readmission or Post Hospitalization Death Predicts 30-day readmission or death.
Likelihood Ratio MultiCalc Estimates how much a test result will change the odds of having a disease.
Low anterior resection syndrome (LARS) score Symptom-based scoring system for bowel dysfunction after low anterior resection (LAR) for rectal cancer.

M

Maintenance Fluid Calculation for Children Calculates maintenance fluid requirements by weight.
Mangled Extremity Severity Score (MESS score) Estimates viability of an extremity after trauma.
Mantle Cell Lymphoma International Prognostic Index (MIPI) Estimates prognosis in mantle cell lymphoma.
Mayo score for assessing ulcerative colitis activity Assesses severity of ulcerative colitis.
MDACC Myelodysplastic Syndrome Prognostic Model A prognostic scoring system for myelodysplastic syndrome.
MELD Score for End-Stage Liver Disease (NOT appropriate for patients under the age of 12) Quantifies end-stage liver disease for transplant planning.
MELD Score for End-Stage Liver Disease (NOT appropriate for patients under the age of 12) (SI units) Quantifies end-stage liver disease for transplant planning.
MELDNa Score (2008) for End-Stage Liver Disease (NOT appropriate for patients under the age of 12) Adds sodium to the MELD model for liver cirrhosis.
MELDNa Score (2008) for End-Stage Liver Disease (NOT appropriate for patients under the age of 12) (SI units) Adds sodium to the MELD model for liver cirrhosis.
MELDNa Score (2016) Quantifies end-stage liver disease.
MELDNa Score (2016) (SI units) Quantifies end-stage liver disease.
Metabolic Syndrome Criteria (AACE 2003) American Association of Clinical Endocrinologists calculator for metabolic syndrome.
Metabolic Syndrome Criteria (AHA/NHLBI 2005) American Heart Association/National Heart, Lung and Blood Institute calculator for metabolic syndrome.
Metabolic Syndrome Criteria (EGIR) European Group for the Study of Insulin Resistance calculator for metabolic syndrome.
Metabolic Syndrome Criteria (IDF 2005) International Diabetes Federation calculator for metabolic syndrome.
Migraine Screener Scores likelihood of migraine.
Migraine With Aura Diagnostic Criteria Criteria for migraine with aura.
Migraine Without Aura Diagnostic Criteria Criteria for migraine without aura.
Modified Maddrey's Discriminant Function Suggests which patients with alcoholic hepatitis may benefit from corticosteroids.
Modified Wells score for deep vein thrombosis (DVT) Calculates risk of DVT.
MODS Score: Multiple Organ Dysfunction Predicts hospital/ICU mortality and ICU length of stay based on measures of multiple organ dysfunction.
Multinational Association for Supportive Care in Cancer (MASCC) risk index for patients with neutropenic fever Risk index for people with neutropenic fever.
Mutation and Karyotype-Enhanced International Prognostic Scoring System for Primary Myelofibrosis in adults 70 and younger (MIPSS70+ version 2.0) Assesses risk and prognosis in primary myelofibrosis (includes genetic mutations).
Myelodysplastic Syndrome International Prognostic Scoring System Prognostic assessment for myelodysplastic syndrome.

N

NAFLD Fibrosis Score Utilises age, hyperglycaemia, BMI, platelet count, albumin, and AST:ALT ratio (AAR) to predict patients with advanced liver fibrosis
Nasal Canula Oxygen Fractional Inspired O2 (FIO2) Estimate Estimates fraction of inspired oxygen using oxygen flow rate and percent.
Negative Predictive Value of a Test Probability with a negative screening test of not having the disease.
New Orleans Head CT Criteria Criteria for head CT after head trauma.
Newborn Hyperbilirubinemia Assessment Assessment including infant age, bilirubin level, and clinical risk group.
NIH Chronic Prostatitis Symptom Index Assesses symptom severity in men with chronic prostatitis/chronic pelvic pain syndrome.
NIH Stroke Score Quantifies stroke severity based on multiple neurologic factors.
Norton Scale to Stratify Risk of Pressure Sores Assessment scale for risk of pressure ulcers.

O

Odds Ratio and Relative Risk Calculates odds ratio and relative risk.
ORBIT Bleeding Risk Score Scoring system for assessing the risk of bleeding in people with atrial fibrillation being considered for oral anticoagulation, or for the review of people with atrial fibrillation already taking anticoagulation.
Osmolal Gap Calculator Calculates osmolal gap to detect unmeasured compounds in serum.
Osmolal Gap Calculator (SI units) Calculates osmolal gap to detect unmeasured compounds in serum (SI units).
Osmolality Estimator (serum) Estimates serum osmolality with sodium, glucose, and BUN.
Osmolar Clearance Calculates renal osmolar clearance using urine/serum Osm and urine volume per day.
Osteoporosis Risk Assessment by Composite Linear Estimate (ORACLE score) Osteoporosis risk assessment score (age, BMI, hormone replacement, fracture history, ultrasound bone profile index).
Osteoporosis Risk Assessment Index (ORAI) Osteoporosis risk assessment index (age, body weight).
Osteoporosis Risk SCORE (Simple Calculated Osteoporosis Risk Estimation) Osteoporosis risk assessment score (ancestry, rheumatoid arthritis, fracture history, age, hormone replacement, weight).
Oswestry Disability Index Version 1 Disability index for low back pain based on questions in 10 areas of function.
Oswestry Disability Index Version 2 Disability index for low back pain based on questions in 10 areas of function.
Ottawa Ankle Rule for the Use of X-Ray in Ankle Injury Describes criteria for ankle trauma patients to determine need for imaging.
Ottawa Foot Rule for the Use of X-Ray in Foot Injury Describes criteria for foot trauma patients to determine need for imaging.
Ottawa Knee Rule for use of X Ray in Knee Injury Describes criteria for knee trauma patients to determine need for imaging.

P

Padua Score for Assessing Venous Thromboembolism Risk in Hospitalized Patients Determines need for VTE prophylaxis in hospitalized patients.
Palliative Prognostic Score in Terminal Illness 30-day probability of survival in terminal illness.
Pancreatitis Prognosis Criteria Mortality scale for acute pancreatitis, based on criteria from admission to day 2 of hospitalization.
Pancreatitis Prognosis Criteria When Disease Due To Gallstones Mortality scale for gallstone-related acute pancreatitis, based on criteria from admission to day 2 of hospitalization.
Panic Disorder Screener Likelihood of panic disorder based on features over last 6 months.
PASI Psoriasis Area and Severity Index Severity index for psoriasis based on surface area, erythema, induration, desquamation.
Peak Expiratory Flow Prediction Predicts peak expiratory flow based on height and age.
PELD Score for End-Stage Liver Disease (patients less than 12 years old) Calculates the pediatric version of the MELD score for liver cirrhosis severity and transplant planning.
PERC Rule for the Assessment of Possible Pulmonary Embolism Rules out PE if no criteria are present and pre-test probability is less than or equal to 15%.
Pneumothorax Degree of Collapse Calculates pneumothorax volume (%) using lung and hemithorax diameters.
Polycythemia Vera Diagnostic Criteria Criteria for polycythemia vera including splenomegaly and laboratory features.
Positive Predictive Value of a Test Probability with a positive screening test of having the disease.
Post Test Probability from Pre Test Probability, Sensitivity and Specificity Post-test probability calculator for having a disease.
Post-Test Probability from Likelihood Ratios and Multiple Test Results Post-test probability calculator for having a disease.
Predicted postoperative FEV1 following lung resection surgery (anatomic method) Predicted postoperative FEV1 after lung resection using lung anatomy.
Predicted postoperative FEV1 following lung resection surgery (perfusion method) Predicted postoperative FEV1 after lung resection using perfusion scan.
Pretest Probability of Heparin Induced Thrombocytopenia (4-T's score) Assesses the risk for heparin-induced thrombocytopenia.
Pulmonary Embolism Risk by Pisa Study (with chest x-ray) Risk score for pulmonary embolism (age, gender, risk factors) including chest x-ray.
Pulmonary Embolism Risk by Pisa Study (without chest x-ray) Risk score for pulmonary embolism (age, gender, risk factors) excluding chest x-ray.
Pulmonary Embolism Severity Index (PESI) Stratifies severity of pulmonary embolism from very low to very high risk.
Pulmonary Embolism Wells Score Calculates probability of pulmonary embolism.

Q

QT Interval Correction (EKG) Corrects QT interval for heart rate.

R

Residual Renal Function in Hemodialysis Patients (Kru) Residual kidney function for people receiving hemodialysis.
Revised Geneva Score for Estimation of the Clinical Probability of Pulmonary Embolism in Adults Calculates probability of pulmonary embolism based solely on clinical variables and independent from subjective judgement.
Rheumatoid arthritis Clinical Disease Activity Index (CDAI) Disease activity scoring system for rheumatoid arthritis.
Rheumatoid arthritis Disease Activity Score with C-reactive protein (DAS28-CRP) Determines severity of rheumatoid arthritis using clinical data and CRP.
Rheumatoid arthritis Disease Activity Score with Erythrocyte Sedimentation Rate (DAS28-ESR) Determines severity of rheumatoid arthritis using clinical data and ESR.
Rheumatoid arthritis Simplified Disease Activity Index (SDAI) Determines severity of rheumatoid arthritis using clinical and laboratory data.
Right to Left Shunt Fraction Qs/Qt Right to left shunt fraction (Qs/Qt) calculator using temperature, altitude, paCO2, and paO2.
Risk Reduction / Number Needed to Treat Multicalc Calculates risk reduction/number needed to treat.
Rockall Score for Upper Gastrointestinal Bleeding Determines severity of GI bleeding.
Roland-Morris Disability Score Scoring for physical disability caused by low back pain.
ROSE score: risk stratification of syncope in the emergency department Assesses 1-month risk of serious outcomes or death in syncope patients in the emergency department.
Rotator Cuff Tear Diagnosis Probability of rotator cuff tear based on physical findings.

S

San Francisco Syncope Rule TreeCalc Assesses 7-day risk of serious outcomes in patients with syncope or near-syncope.
Sequential Organ Failure Assessment (Quick): qSOFA Score Bedside clinical assessment to detect risk of deterioration due to sepsis.
Sequential Organ Failure Assessment: SOFA Score Predicts ICU mortality using clinical and laboratory data.
SI unit to conventional unit conversions: Chemistry and endocrine tests SI unit conversions for chemistries and endocrine tests.
SI unit to conventional unit conversions: Immunology test values Unit conversions for immunology tests.
Simplified Pulmonary Embolism Severity Index (sPESI) Risk stratifies patients with PE and can help identify those suitable for outpatient management.
Sodium Correction in Hyperglycemia (Hillier 1999) Determines if true hyponatremia is present in a patient with hyperglycemia.
Sokal score for chronic myeloid leukemia Estimates survival in patients with chronic myeloid leukaemia.
Sore Throat (Pharyngitis) Evaluation and Treatment Criteria (McIsaac) Scoring system for sore throat including clinical features such as age, fever, lymphadenopathy or exudate.
Standard Drink Equivalents Alcohol drink equivalents.
Stool Osmolal Gap Determines if chronic diarrhea is osmotic or secretory.
Stroke Risk in Diabetes Type 2 UKPDS 60 Models chance of a first stroke in type 2 diabetes using risk factors.
Stroke Risk in Female Patients 55-84 Years Old (Framingham data) Stroke risk for women.
Stroke Risk in Male Patients 55-84 Years Old (Framingham data) Stroke risk for men.
Systemic Vascular Resistance Calculates systemic vascular resistance using cardiologic parameters.

T

Temperature Unit Conversions Temperature converter: Celsius, Fahrenheit, Kelvin.
Thrombolysis in Myocardial Infarction (TIMI) Score for ST Elevation Acute Myocardial Infarction Estimates mortality in patients with STEMI.
Thrombolysis in Myocardial Infarction (TIMI) Score for Unstable Angina Non ST Elevation Myocardial Infarction Estimates mortality in patients with unstable angina or NSTEMI.
TIA Prognosis: Risk of Stroke by 90 Days After Presentation Approximate 90-day risk of stroke following TIA.

U

Urine anion gap Aids in identifying causes of metabolic acidosis where there is no serum anion gap.

V

Venous Leg Ulcer Healing Prediction Score for venous leg ulcer healing in 24 weeks based on duration and area.

W

Weight Unit Conversions International weight conversions.
WHO Assessment of Malnutrition in Boys 2 to 5 years Old WHO score for malnutrition based on age, height and weight.
WHO Assessment of Malnutrition in Girls 2 to 5 years Old WHO score for malnutrition based on age, height and weight.
WHO infant head circumference for age percentiles (<24 months) WHO head circumference percentiles birth to 24 months.
WHO Infant Length for Age Percentiles (<24 months) WHO growth chart: length for age percentiles birth to 24 months.
WHO Infant Weight for Age Percentiles (<24 months) WHO growth chart: weight for age percentiles birth to 24 months.
WHO infant weight for length percentiles (<24 months) WHO growth chart: weight for length percentiles birth to 24 months.

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Anaesthesia

Cardiac output Calculates cardiac output.

Cardiac Risk Index for Non-AAA Vascular Surgery (Lee) Estimates risk of cardiac complications following vascular surgery (non-abdominal aortic aneurysm).

Cardiac Risk Index for Orthopedic Surgery (Lee) Estimates risk of cardiac complications following orthopedic surgery.

Cardiac Risk Index in Noncardiac Surgery (Detsky et. al.) Estimates risk of cardiac complications following noncardiac surgery.

Cardiac Risk Index in Noncardiac Surgery (Goldman, et. al.) Estimates risk of cardiac complications following noncardiac surgery.

EuroSCORE for Cardiac Surgery Risk Assessment (additive version) Calculates risk of mortality in patients undergoing cardiac surgery.

Right to Left Shunt Fraction Qs/Qt Right to left shunt fraction (Qs/Qt) calculator using temperature, altitude, paCO2, and paO2.

Anthropometrics

Body Mass Index (BMI) (Quetelet's index) Assesses whether patient is at a weight appropriate for their height.

Body Mass Index (BMI) percentiles for boys (2 to 20 years) Assesses whether patient is at a weight appropriate for their height, age, and gender.

Body Mass Index (BMI) percentiles for girls (2 to 20 years) Assesses whether patient is at a weight appropriate for their height, age, and gender.

Body Surface Area (Du Bois Method) Calculation of body surface area.

Body Surface Area (Gehan & George Method) Calculation of body surface area.

Body Surface Area (Mosteller, square root method) Calculation of body surface area.

Body Surface Area Based Dosing Calculates drug dose based on body surface area.

CDC height for age percentiles for boys (2 to 20 years) Assesses whether patient is at appropriate height for their age.

CDC height for age percentiles for girls (2 to 20 years) Assesses whether patient is at appropriate height for their age.

CDC/NCHS Infant Head Circumference for Age Percentiles (<36 months) Assesses whether patient has appropriate head circumference for their age.

WHO Assessment of Malnutrition in Boys 2 to 5 years Old WHO score for malnutrition based on age, height and weight.

WHO Assessment of Malnutrition in Girls 2 to 5 years Old WHO score for malnutrition based on age, height and weight.

WHO infant head circumference for age percentiles (<24 months) WHO head circumference percentiles birth to 24 months.

WHO Infant Length for Age Percentiles (<24 months) WHO growth chart: length for age percentiles birth to 24 months.

WHO Infant Weight for Age Percentiles (<24 months) WHO growth chart: weight for age percentiles birth to 24 months.

WHO infant weight for length percentiles (<24 months) WHO growth chart: weight for length percentiles birth to 24 months.

Cardiology

Acute Heart Failure Prediction Based on NT-proBNP and Clinical Features Estimates risk of acute heart failure.

Atrial fibrillation CHADS(2) score for stroke risk Estimates risk of stroke in patients with atrial fibrillation.

Cardiac Risk Index for Non-AAA Vascular Surgery (Lee) Estimates risk of cardiac complications following vascular surgery (non-abdominal aortic aneurysm).

Cardiac Risk Index for Orthopedic Surgery (Lee) Estimates risk of cardiac complications following orthopedic surgery.

Cardiac Risk Index in Noncardiac Surgery (Detsky et. al.) Estimates risk of cardiac complications following noncardiac surgery.

Cardiac Risk Index in Noncardiac Surgery (Goldman, et. al.) Estimates risk of cardiac complications following noncardiac surgery.

Cardiovascular Risk Assessment (10-year, ACC/AHA 2013) Estimates 10-year risk of cardiovascular disease based on key risk factors.

Cardiovascular risk assessment (10-year, MESA 2015, with or without CAC score) Ten-year cardiovascular risk assessment with or without coronary artery calcification score.

Cardiovascular Risk Assessment (10-year, PROCAM Score, Munster Heart Study SI units) Ten-year cardiovascular risk score based on Munster study with cholesterol levels in SI units.

Cardiovascular Risk Assessment (10-year, PROCAM Score, Munster Heart Study) Ten-year cardiovascular risk score based on Munster study with cholesterol levels in mg/dL.

Cardiovascular Risk Assessment in Men (10-year, patient information, Framingham 2008) Cardiovascular risk score that includes patient information for men.

Cardiovascular Risk Assessment in Men (10-year, Reynolds Risk Score 2008) Ten-year cardiovascular risk score that includes C-reactive protein as well as other criteria.

Cardiovascular Risk Assessment in Type I Diabetes (5-year) Estimates 5-year risk of cardiovascular disease in patients with type I diabetes.

Cardiovascular Risk Assessment in Women (10-year, patient information, Framingham 2008) Cardiovascular risk score that includes patient information for women.

Endocarditis Diagnostic Criteria -- Duke Criteria Pathological and major/minor clinical criteria for endocarditis.

Endocarditis Diagnostic Criteria -- Modified Duke Criteria Updated clinicopathological criteria for endocarditis.

EuroSCORE for Cardiac Surgery Risk Assessment (additive version) Calculates risk of mortality in patients undergoing cardiac surgery.

Friedewald Equation for Low Density Lipoprotein (LDL-C) Estimates concentration of LDL-C in plasma.

Friedewald Equation for Low Density Lipoprotein (LDL-C, SI units) Estimates concentration of LDL-C in plasma.

GRACE Score for Acute Coronary Syndrome Prognosis Estimates mortality risk for patients with acute coronary syndrome.

HAS-BLED Bleeding Risk Score Estimates risk of major bleeding for patients with atrial fibrillation on oral anticoagulation.

Heart Failure Diagnosis Clinical criteria for diagnosis of heart failure.

Intracranial Bleeding Risk from Thrombolytic Therapy of MI Estimates risk of cerebral bleeding in patients treated with thrombolytic therapy for mycocardial infarction.

Jones Criteria for Diagnosis of Rheumatic Fever Diagnostic criteria for rheumatic fever.

Kawasaki Disease Diagnostic Criteria Diagnostic criteria for Kawasaki disease.

Metabolic Syndrome Criteria (AACE 2003) American Association of Clinical Endocrinologists calculator for metabolic syndrome.

Metabolic Syndrome Criteria (AHA/NHLBI 2005) American Heart Association/National Heart, Lung and Blood Institute calculator for metabolic syndrome.

Metabolic Syndrome Criteria (EGIR) European Group for the Study of Insulin Resistance calculator for metabolic syndrome.

Metabolic Syndrome Criteria (IDF 2005) International Diabetes Federation calculator for metabolic syndrome.

ORBIT Bleeding Risk Score Scoring system for assessing the risk of bleeding in people with atrial fibrillation being considered for oral anticoagulation, or for the review of people with atrial fibrillation already taking anticoagulation.

Padua Score for Assessing Venous Thromboembolism Risk in Hospitalized Patients Determines need for VTE prophylaxis in hospitalized patients.

Panic Disorder Screener Likelihood of panic disorder based on features over last 6 months.

QT Interval Correction (EKG) Corrects QT interval for heart rate.

Right to Left Shunt Fraction Qs/Qt Right to left shunt fraction (Qs/Qt) calculator using temperature, altitude, paCO2, and paO2.

ROSE score: risk stratification of syncope in the emergency department Assesses 1-month risk of serious outcomes or death in syncope patients in the emergency department.

San Francisco Syncope Rule TreeCalc Assesses 7-day risk of serious outcomes in patients with syncope or near-syncope.

Sequential Organ Failure Assessment: SOFA Score Predicts ICU mortality using clinical and laboratory data.

Simplified Pulmonary Embolism Severity Index (sPESI) Risk stratifies patients with PE and can help identify those suitable for outpatient management.

Systemic Vascular Resistance Calculates systemic vascular resistance using cardiologic parameters.

Thrombolysis in Myocardial Infarction (TIMI) Score for ST Elevation Acute Myocardial Infarction Estimates mortality in patients with STEMI.

Thrombolysis in Myocardial Infarction (TIMI) Score for Unstable Angina Non ST Elevation Myocardial Infarction Estimates mortality in patients with unstable angina or NSTEMI.

Critical Care

A-a Gradient Calculates difference between alveolar and arterial oxygen concentration.

APACHE II scoring system Estimates ICU mortality.

BAP-65 prediction of in-hospital mortality and need for mechanical ventilation in COPD Predicts risk of mortality and need for mechanical ventilation in acute exacerbations of COPD.

Base Excess Determination Aids in identifying acid-base disorders.

Bedside Index of Severity in Acute Pancreatitis (BISAP) Score Predicts risk of mortality in acute pancreatitis.

Blatchford score for gastrointestinal bleeding Stratifies patients with upper GI bleed, identifying those who can be safely treated as outpatients.

Blood Ethanol Concentration Estimation Estimates blood ethanol concentration.

BODE Index for COPD Survival Prediction Estimates prognosis in patients with COPD based on body mass index, airflow obstruction, dyspnea, and exercise.

Cardiac output Calculates cardiac output.

Clinical Grading to Predict Malignant Hyperthermia Historical, clinical and laboratory features to assess malignant hyperthermia.

Clinical Pulmonary Infection Score (CPIS) Aids in early diagnosis and treatment of ventilator-associated pneumonia.

CURB-65 pneumonia severity score Predicts risk of mortality in community-acquired pneumonia.

EuroSCORE for Cardiac Surgery Risk Assessment (additive version) Calculates risk of mortality in patients undergoing cardiac surgery.

Glasgow Alcoholic Hepatitis Score Estimates mortality risk in patients with alcoholic hepatitis.

Glasgow Blatchford Score for Gastrointestinal Bleeding Stratifies patients with upper GI bleed, identifying those who can be safely treated as outpatients.

GRACE Score for Acute Coronary Syndrome Prognosis Estimates mortality risk for patients with acute coronary syndrome.

HAS-BLED Bleeding Risk Score Estimates risk of major bleeding for patients with atrial fibrillation on oral anticoagulation.

Heart Failure Diagnosis Clinical criteria for diagnosis of heart failure.

Injury Severity Score (ISS) Assesses severity of traumatic injury.

Intracranial Bleeding Risk from Thrombolytic Therapy of MI Estimates risk of cerebral bleeding in patients treated with thrombolytic therapy for mycocardial infarction.

Maintenance Fluid Calculation for Children Calculates maintenance fluid requirements by weight.

Mangled Extremity Severity Score (MESS score) Estimates viability of an extremity after trauma.

MELD Score for End-Stage Liver Disease (NOT appropriate for patients under the age of 12) Quantifies end-stage liver disease for transplant planning.

MELD Score for End-Stage Liver Disease (NOT appropriate for patients under the age of 12) (SI units) Quantifies end-stage liver disease for transplant planning.

MELDNa Score (2008) for End-Stage Liver Disease (NOT appropriate for patients under the age of 12) Adds sodium to the MELD model for liver cirrhosis.

MELDNa Score (2008) for End-Stage Liver Disease (NOT appropriate for patients under the age of 12) (SI units) Adds sodium to the MELD model for liver cirrhosis.

MELDNa Score (2016) Quantifies end-stage liver disease.

MELDNa Score (2016) (SI units) Quantifies end-stage liver disease.

MODS Score: Multiple Organ Dysfunction Predicts hospital/ICU mortality and ICU length of stay based on measures of multiple organ dysfunction.

NIH Stroke Score Quantifies stroke severity based on multiple neurologic factors.

Osmolality Estimator (serum) Estimates serum osmolality with sodium, glucose, and BUN.

Palliative Prognostic Score in Terminal Illness 30-day probability of survival in terminal illness.

Pancreatitis Prognosis Criteria Mortality scale for acute pancreatitis, based on criteria from admission to day 2 of hospitalization.

Pancreatitis Prognosis Criteria When Disease Due To Gallstones Mortality scale for gallstone-related acute pancreatitis, based on criteria from admission to day 2 of hospitalization.

PELD Score for End-Stage Liver Disease (patients less than 12 years old) Calculates the pediatric version of the MELD score for liver cirrhosis severity and transplant planning.

Pneumothorax Degree of Collapse Calculates pneumothorax volume (%) using lung and hemithorax diameters.

Pulmonary Embolism Risk by Pisa Study (with chest x-ray) Risk score for pulmonary embolism (age, gender, risk factors) including chest x-ray.

Pulmonary Embolism Risk by Pisa Study (without chest x-ray) Risk score for pulmonary embolism (age, gender, risk factors) excluding chest x-ray.

Pulmonary Embolism Severity Index (PESI) Stratifies severity of pulmonary embolism from very low to very high risk.

Pulmonary Embolism Wells Score Calculates probability of pulmonary embolism.

Right to Left Shunt Fraction Qs/Qt Right to left shunt fraction (Qs/Qt) calculator using temperature, altitude, paCO2, and paO2.

Rockall Score for Upper Gastrointestinal Bleeding Determines severity of GI bleeding.

Sequential Organ Failure Assessment (Quick): qSOFA Score Bedside clinical assessment to detect risk of deterioration due to sepsis.

Sequential Organ Failure Assessment: SOFA Score Predicts ICU mortality using clinical and laboratory data.

Simplified Pulmonary Embolism Severity Index (sPESI) Risk stratifies patients with PE and can help identify those suitable for outpatient management.

Sodium Correction in Hyperglycemia (Hillier 1999) Determines if true hyponatremia is present in a patient with hyperglycemia.

Thrombolysis in Myocardial Infarction (TIMI) Score for ST Elevation Acute Myocardial Infarction Estimates mortality in patients with STEMI.

Thrombolysis in Myocardial Infarction (TIMI) Score for Unstable Angina Non ST Elevation Myocardial Infarction Estimates mortality in patients with unstable angina or NSTEMI.

Dermatology

Kawasaki Disease Diagnostic Criteria Diagnostic criteria for Kawasaki disease.

Norton Scale to Stratify Risk of Pressure Sores Assessment scale for risk of pressure ulcers.

PASI Psoriasis Area and Severity Index Severity index for psoriasis based on surface area, erythema, induration, desquamation.

Emergency medicine

ABCD2 Score to Predict Stroke Risk after TIA Estimates the risk of stroke following transient ischemic attack.

Acetaminophen (Paracetamol) Toxicity Assessment (Original, 1975) Calculator to guide management following a single acetaminophen (paracetamol) ingestion, based on time since ingestion and blood acetaminophen level, using the original 1975 Rumack and Matthew calculation.

Acetaminophen (Paracetamol) Toxicity Assessment (Revised 2023) Calculator to guide management following a single acetaminophen (paracetamol) ingestion, based on time since ingestion and blood acetaminophen level, using the 2023 revision of the Rumack and Matthew calculation.

Acute Heart Failure Prediction Based on NT-proBNP and Clinical Features Estimates risk of acute heart failure.

Anion Gap Aids in identifying causes of metabolic acidosis.

Anion Gap Delta Delta Gradient Multicalc Aids in identifying acid-base disorders.

Anion Gap Delta Delta Ratio Multicalc Aids in identifying acid-base disorders.

BAP-65 prediction of in-hospital mortality and need for mechanical ventilation in COPD Predicts risk of mortality and need for mechanical ventilation in acute exacerbations of COPD.

Blood Ethanol Concentration Estimation Estimates blood ethanol concentration.

Burn Injury Fluid Resuscitation (Brooke estimate) Estimates fluid requirements following burn injury.

Burn Injury Fluid Resuscitation (Demling dextran estimate) Estimates colloid fluid requirements following burn injury.

Burn Injury Fluid Resuscitation (Evans estimate) Estimates fluid requirements following burn injury.

Burn Injury Fluid Resuscitation (Modified Brooke crystalloid estimate) Estimates fluid requirements following burn injury.

Burn Injury Fluid Resuscitation (Slater estimate) Estimates fluid requirements following burn injury.

Burn Injury Fluid Resuscitation, Adult (Parkland crystalloid estimate) Often used to estimate fluid requirements in adults following major burn injury.

Canadian Head CT Rule for Minor Head Injury Assesses which patients with minor head injury need CT scan.

CIWA-Ar Clinical Institute Withdrawal Assessment for Alcohol scale Measures severity of alcohol withdrawal syndrome.

Clinical Grading to Predict Malignant Hyperthermia Historical, clinical and laboratory features to assess malignant hyperthermia.

Community-acquired pneumonia severity index (PSI) for adults Estimates risk of mortality in patients with community-acquired pneumonia.

CURB-65 pneumonia severity score Predicts risk of mortality in community-acquired pneumonia.

Glasgow Blatchford Score for Gastrointestinal Bleeding Stratifies patients with upper GI bleed, identifying those who can be safely treated as outpatients.

HAS-BLED Bleeding Risk Score Estimates risk of major bleeding for patients with atrial fibrillation on oral anticoagulation.

Heart Failure Diagnosis Clinical criteria for diagnosis of heart failure.

Intracranial Bleeding Risk from Thrombolytic Therapy of MI Estimates risk of cerebral bleeding in patients treated with thrombolytic therapy for mycocardial infarction.

Migraine Screener Scores likelihood of migraine.

Migraine With Aura Diagnostic Criteria Criteria for migraine with aura.

Migraine Without Aura Diagnostic Criteria Criteria for migraine without aura.

New Orleans Head CT Criteria Criteria for head CT after head trauma.

Ottawa Ankle Rule for the Use of X-Ray in Ankle Injury Describes criteria for ankle trauma patients to determine need for imaging.

Ottawa Foot Rule for the Use of X-Ray in Foot Injury Describes criteria for foot trauma patients to determine need for imaging.

Panic Disorder Screener Likelihood of panic disorder based on features over last 6 months.

PERC Rule for the Assessment of Possible Pulmonary Embolism Rules out PE if no criteria are present and pre-test probability is less than or equal to 15%.

Pneumothorax Degree of Collapse Calculates pneumothorax volume (%) using lung and hemithorax diameters.

Pulmonary Embolism Severity Index (PESI) Stratifies severity of pulmonary embolism from very low to very high risk.

Pulmonary Embolism Wells Score Calculates probability of pulmonary embolism.

QT Interval Correction (EKG) Corrects QT interval for heart rate.

Revised Geneva Score for Estimation of the Clinical Probability of Pulmonary Embolism in Adults Calculates probability of pulmonary embolism based solely on clinical variables and independent from subjective judgement.

Sequential Organ Failure Assessment: SOFA Score Predicts ICU mortality using clinical and laboratory data.

Simplified Pulmonary Embolism Severity Index (sPESI) Risk stratifies patients with PE and can help identify those suitable for outpatient management.

Sodium Correction in Hyperglycemia (Hillier 1999) Determines if true hyponatremia is present in a patient with hyperglycemia.

TIA Prognosis: Risk of Stroke by 90 Days After Presentation Approximate 90-day risk of stroke following TIA.

Urine anion gap Aids in identifying causes of metabolic acidosis where there is no serum anion gap.

Endocrinology

Calcium Correction in Hypoalbuminemia Calculates corrected calcium level for patients with hypoalbuminemia.

Calcium Correction in Hypoalbuminemia (SI units) Calculates corrected calcium level for patients with hypoalbuminemia.

Cirrhosis probability in hepatitis C (FIB-4) Calculates FIB-4 index which is a non-invasive method of screening for clinically significant hepatic fibrosis secondary to metabolic dysfunction-associated steatotic liver disease (MASLD)

Friedewald Equation for Low Density Lipoprotein (LDL-C) Estimates concentration of LDL-C in plasma.

Friedewald Equation for Low Density Lipoprotein (LDL-C, SI units) Estimates concentration of LDL-C in plasma.

Glomerular Filtration Rate Estimation (eGFR) by Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) Equation with Creatinine, without Race (2021) Estimates glomerular filtration rate based on creatinine and patient characteristics without a race variable.

HOMA Formula: Homeostasis Model Assessment of Insulin Resistance Estimates severity of insulin resistance.

NAFLD Fibrosis Score Utilises age, hyperglycaemia, BMI, platelet count, albumin, and AST:ALT ratio (AAR) to predict patients with advanced liver fibrosis

Sodium Correction in Hyperglycemia (Hillier 1999) Determines if true hyponatremia is present in a patient with hyperglycemia.

Stroke Risk in Diabetes Type 2 UKPDS 60 Models chance of a first stroke in type 2 diabetes using risk factors.

Epidemiology

Bayesian Statistics I MultiCalc Calculates statistics from prevalence, sensitivity, and specificity.

Bayesian Statistics II MultiCalc Calculates statistics from true and false positives and negatives.

Body Mass Index (BMI) percentiles for boys (2 to 20 years) Assesses whether patient is at a weight appropriate for their height, age, and gender.

Body Mass Index (BMI) percentiles for girls (2 to 20 years) Assesses whether patient is at a weight appropriate for their height, age, and gender.

Cardiovascular Risk Assessment (10-year, ACC/AHA 2013) Estimates 10-year risk of cardiovascular disease based on key risk factors.

CDC height for age percentiles for boys (2 to 20 years) Assesses whether patient is at appropriate height for their age.

CDC height for age percentiles for girls (2 to 20 years) Assesses whether patient is at appropriate height for their age.

CDC/NCHS Infant Head Circumference for Age Percentiles (<36 months) Assesses whether patient has appropriate head circumference for their age.

Glomerular Filtration Rate Estimate in African Americans by AASK Equation Estimates glomerular filtration rate based on creatinine and patient's age and gender.

Kidney Failure Risk (KFRE) (8 variable) Estimates risk of kidney failure incorporating coefficients representative of the North American cohort in Tangri et al (2016). Urine albumin to creatinine ratio expressed in mg/g.

Likelihood Ratio MultiCalc Estimates how much a test result will change the odds of having a disease.

Negative Predictive Value of a Test Probability with a negative screening test of not having the disease.

Odds Ratio and Relative Risk Calculates odds ratio and relative risk.

Positive Predictive Value of a Test Probability with a positive screening test of having the disease.

Post Test Probability from Pre Test Probability, Sensitivity and Specificity Post-test probability calculator for having a disease.

Post-Test Probability from Likelihood Ratios and Multiple Test Results Post-test probability calculator for having a disease.

WHO Assessment of Malnutrition in Boys 2 to 5 years Old WHO score for malnutrition based on age, height and weight.

WHO Assessment of Malnutrition in Girls 2 to 5 years Old WHO score for malnutrition based on age, height and weight.

WHO infant head circumference for age percentiles (<24 months) WHO head circumference percentiles birth to 24 months.

WHO Infant Length for Age Percentiles (<24 months) WHO growth chart: length for age percentiles birth to 24 months.

WHO Infant Weight for Age Percentiles (<24 months) WHO growth chart: weight for age percentiles birth to 24 months.

WHO infant weight for length percentiles (<24 months) WHO growth chart: weight for length percentiles birth to 24 months.

Gastroenterology

Bedside Index of Severity in Acute Pancreatitis (BISAP) Score Predicts risk of mortality in acute pancreatitis.

Blatchford score for gastrointestinal bleeding Stratifies patients with upper GI bleed, identifying those who can be safely treated as outpatients.

Child Pugh classification for severity of liver disease Assesses severity of liver disease.

Child Pugh classification for severity of liver disease (SI units) Assesses severity of liver disease.

Crohn's Disease Activity Index (CDAI) Assesses severity of Crohn disease.

Glasgow Alcoholic Hepatitis Score Estimates mortality risk in patients with alcoholic hepatitis.

Glasgow Blatchford Score for Gastrointestinal Bleeding Stratifies patients with upper GI bleed, identifying those who can be safely treated as outpatients.

Harvey-Bradshaw Index of Crohn's Disease Activity Assessment of Crohn's disease activity including extraintestinal features.

Irritable Bowel Syndrome Diagnostic Criteria (Manning Criteria) Diagnostic criteria for irritable bowel syndrome.

Mayo score for assessing ulcerative colitis activity Assesses severity of ulcerative colitis.

MELD Score for End-Stage Liver Disease (NOT appropriate for patients under the age of 12) Quantifies end-stage liver disease for transplant planning.

MELD Score for End-Stage Liver Disease (NOT appropriate for patients under the age of 12) (SI units) Quantifies end-stage liver disease for transplant planning.

MELDNa Score (2008) for End-Stage Liver Disease (NOT appropriate for patients under the age of 12) Adds sodium to the MELD model for liver cirrhosis.

MELDNa Score (2008) for End-Stage Liver Disease (NOT appropriate for patients under the age of 12) (SI units) Adds sodium to the MELD model for liver cirrhosis.

MELDNa Score (2016) Quantifies end-stage liver disease.

MELDNa Score (2016) (SI units) Quantifies end-stage liver disease.

NAFLD Fibrosis Score Utilises age, hyperglycaemia, BMI, platelet count, albumin, and AST:ALT ratio (AAR) to predict patients with advanced liver fibrosis

Osmolal Gap Calculator Calculates osmolal gap to detect unmeasured compounds in serum.

Pancreatitis Prognosis Criteria Mortality scale for acute pancreatitis, based on criteria from admission to day 2 of hospitalization.

Pancreatitis Prognosis Criteria When Disease Due To Gallstones Mortality scale for gallstone-related acute pancreatitis, based on criteria from admission to day 2 of hospitalization.

PELD Score for End-Stage Liver Disease (patients less than 12 years old) Calculates the pediatric version of the MELD score for liver cirrhosis severity and transplant planning.

Rockall Score for Upper Gastrointestinal Bleeding Determines severity of GI bleeding.

Stool Osmolal Gap Determines if chronic diarrhea is osmotic or secretory.

Geriatric

APACHE II scoring system Estimates ICU mortality.

Body Mass Index (BMI) (Quetelet's index) Assesses whether patient is at a weight appropriate for their height.

Body Surface Area (Du Bois Method) Calculation of body surface area.

Body Surface Area (Gehan & George Method) Calculation of body surface area.

Body Surface Area (Mosteller, square root method) Calculation of body surface area.

Body Surface Area Based Dosing Calculates drug dose based on body surface area.

Breast Cancer Recurrence Risk After Mastectomy (simple) Assesses risk of breast cancer recurrence after mastectomy based on tumor grade and lymphatic involvement.

Cardiac Risk Index in Noncardiac Surgery (Detsky et. al.) Estimates risk of cardiac complications following noncardiac surgery.

Cardiac Risk Index in Noncardiac Surgery (Goldman, et. al.) Estimates risk of cardiac complications following noncardiac surgery.

CHADS-VASc Score for Stroke Risk in Arial Fibrillation (CHA[2]S[2]-VASc) Score for stroke risk in atrial fibrillation.

Cognitive Impairment Screening with 6 Questions Screening tool for cognitive impairment in adults.

Community-acquired pneumonia severity index (PSI) for adults Estimates risk of mortality in patients with community-acquired pneumonia.

Creatinine clearance estimate by Cockcroft-Gault equation Calculates creatinine clearance according to the Cockcroft-Gault equation.

Creatinine clearance estimate by Cockcroft-Gault equation (SI units) Calculates creatinine clearance according to the Cockcroft-Gault equation.

CURB-65 pneumonia severity score Predicts risk of mortality in community-acquired pneumonia.

Depression (any) Screening by a Two Item PHQ-2 Scores for likelihood of any depression.

Depression (major) Screening by a Two Item PHQ-2 Scores for likelihood of major depression.

Fall Risk in Elderly Hospitalized Patients Estimates risk of fall in elderly patients.

Fracture Index WITH known Bone Mineral Density (BMD) Calculates risk of fracture based on factors including bone mineral density.

Fracture Index WITHOUT known Bone Mineral Density (BMD) Calculates risk of fracture based on factors not including bone mineral density.

Geriatric Depression 1 Item Screener Assesses likelihood of depression in elderly patients, based on 1 question.

Geriatric Depression 4 Item Scale Assesses likelihood of depression in elderly patients, based on 4 questions.

Geriatric Depression Scale Assesses likelihood of depression in elderly patients.

Geriatric-Sensitive Perioperative Cardiac Risk Index (GSCRI) This calculator estimates the rate of perioperative myocardial infarction or cardiac arrest (MICA) in patients ≥65 years old.

Glasgow Coma Scale Assessment of conscious level based on eye, verbal, and motor responses to stimuli.

HAS-BLED Bleeding Risk Score Estimates risk of major bleeding for patients with atrial fibrillation on oral anticoagulation.

Intracranial Bleeding Risk from Thrombolytic Therapy of MI Estimates risk of cerebral bleeding in patients treated with thrombolytic therapy for mycocardial infarction.

MODS Score: Multiple Organ Dysfunction Predicts hospital/ICU mortality and ICU length of stay based on measures of multiple organ dysfunction.

Norton Scale to Stratify Risk of Pressure Sores Assessment scale for risk of pressure ulcers.

Osteoporosis Risk Assessment by Composite Linear Estimate (ORACLE score) Osteoporosis risk assessment score (age, BMI, hormone replacement, fracture history, ultrasound bone profile index).

Osteoporosis Risk Assessment Index (ORAI) Osteoporosis risk assessment index (age, body weight).

Osteoporosis Risk SCORE (Simple Calculated Osteoporosis Risk Estimation) Osteoporosis risk assessment score (ancestry, rheumatoid arthritis, fracture history, age, hormone replacement, weight).

Palliative Prognostic Score in Terminal Illness 30-day probability of survival in terminal illness.

Hematology

Absolute Eosinophil Count Assesses number of eosinophils (e.g., in people with allergic or autoimmune conditions, or parasite infections).

Absolute Lymphocyte Count Estimates number of lymphocytes and predicts CD4 count.

Absolute Neutrophil Count Measures number of neutrophils (used to asses neutropenia or neutrophilia).

APACHE II scoring system Estimates ICU mortality.

Atrial fibrillation CHADS(2) score for stroke risk Estimates risk of stroke in patients with atrial fibrillation.

Bleeding Risk (any bleeding complication) on Warfarin Therapy Estimates risk of any bleeding complications for patients on warfarin.

Bleeding Risk (major complication) on Warfarin Therapy Estimates risk of major bleeding complications for patients on warfarin.

Bleeding Risk Index for Warfarin Therapy Estimates risk of bleeding for patients on warfarin.

Body Mass Index (BMI) (Quetelet's index) Assesses whether patient is at a weight appropriate for their height.

Conventional unit to SI unit conversions: Chemistry tests Unit conversions for chemistries.

Conventional unit to SI unit conversions: Immunology test values Unit conversions for immunology tests.

Dynamic International Prognostic Scoring System-Plus (DIPSS-Plus) Assesses risk and prognosis in primary myelofibrosis.

EUTOS long-term survival (ELTS) score Estimates risk of chronic myeloid leukaemia-related death

Genetically Inspired International Prognostic Scoring System (GIPSS) Assesses risk and prognosis in myelofibrosis (includes genetic mutations).

HAS-BLED Bleeding Risk Score Estimates risk of major bleeding for patients with atrial fibrillation on oral anticoagulation.

International Prognostic Score in Hodgkin Lymphoma Estimates freedom from progression and overall survival in patients with Hodgkin lymphoma.

MODS Score: Multiple Organ Dysfunction Predicts hospital/ICU mortality and ICU length of stay based on measures of multiple organ dysfunction.

Mutation and Karyotype-Enhanced International Prognostic Scoring System for Primary Myelofibrosis in adults 70 and younger (MIPSS70+ version 2.0) Assesses risk and prognosis in primary myelofibrosis (includes genetic mutations).

Padua Score for Assessing Venous Thromboembolism Risk in Hospitalized Patients Determines need for VTE prophylaxis in hospitalized patients.

PASI Psoriasis Area and Severity Index Severity index for psoriasis based on surface area, erythema, induration, desquamation.

Polycythemia Vera Diagnostic Criteria Criteria for polycythemia vera including splenomegaly and laboratory features.

Pretest Probability of Heparin Induced Thrombocytopenia (4-T's score) Assesses the risk for heparin-induced thrombocytopenia.

Pulmonary Embolism Risk by Pisa Study (with chest x-ray) Risk score for pulmonary embolism (age, gender, risk factors) including chest x-ray.

Pulmonary Embolism Risk by Pisa Study (without chest x-ray) Risk score for pulmonary embolism (age, gender, risk factors) excluding chest x-ray.

Pulmonary Embolism Wells Score Calculates probability of pulmonary embolism.

SI unit to conventional unit conversions: Chemistry and endocrine tests SI unit conversions for chemistries and endocrine tests.

SI unit to conventional unit conversions: Immunology test values Unit conversions for immunology tests.

Simplified Pulmonary Embolism Severity Index (sPESI) Risk stratifies patients with PE and can help identify those suitable for outpatient management.

Sokal score for chronic myeloid leukemia Estimates survival in patients with chronic myeloid leukaemia.

Infectious Disease

Aminoglycoside Clearance Estimate Estimates rate of aminoglycoside clearance.

Body Surface Area Based Dosing Calculates drug dose based on body surface area.

Clinical Pulmonary Infection Score (CPIS) Aids in early diagnosis and treatment of ventilator-associated pneumonia.

Community-acquired pneumonia severity index (PSI) for adults Estimates risk of mortality in patients with community-acquired pneumonia.

CURB-65 pneumonia severity score Predicts risk of mortality in community-acquired pneumonia.

Hepatitis Discriminant Function for Corticosteroid Therapy in Alcoholic Hepatitis Score parameters including prothrombin time and bilirubin level.

Jones Criteria for Diagnosis of Rheumatic Fever Diagnostic criteria for rheumatic fever.

Kawasaki Disease Diagnostic Criteria Diagnostic criteria for Kawasaki disease.

PELD Score for End-Stage Liver Disease (patients less than 12 years old) Calculates the pediatric version of the MELD score for liver cirrhosis severity and transplant planning.

Sore Throat (Pharyngitis) Evaluation and Treatment Criteria (McIsaac) Scoring system for sore throat including clinical features such as age, fever, lymphadenopathy or exudate.

Temperature Unit Conversions Temperature converter: Celsius, Fahrenheit, Kelvin.

International health

Alcohol Consumption Screening AUDIT Questionnaire Screening tool to identify alcohol use disorders.

Canadian Head CT Rule for Minor Head Injury Assesses which patients with minor head injury need CT scan.

Conventional unit to SI unit conversions: Chemistry tests Unit conversions for chemistries.

Conventional unit to SI unit conversions: Immunology test values Unit conversions for immunology tests.

EuroSCORE for Cardiac Surgery Risk Assessment (additive version) Calculates risk of mortality in patients undergoing cardiac surgery.

Friedewald Equation for Low Density Lipoprotein (LDL-C, SI units) Estimates concentration of LDL-C in plasma.

Glasgow Coma Scale Assessment of conscious level based on eye, verbal, and motor responses to stimuli.

In-Flight PaO2 Estimation Predicts patient's PaO2 during flight.

In-Flight PaO2 Estimation (using PFT's) Predicts patient's PaO2 during flight.

International Prognostic Score in Hodgkin Lymphoma Estimates freedom from progression and overall survival in patients with Hodgkin lymphoma.

Kawasaki Disease Diagnostic Criteria Diagnostic criteria for Kawasaki disease.

Metabolic Syndrome Criteria (EGIR) European Group for the Study of Insulin Resistance calculator for metabolic syndrome.

Metabolic Syndrome Criteria (IDF 2005) International Diabetes Federation calculator for metabolic syndrome.

Ottawa Ankle Rule for the Use of X-Ray in Ankle Injury Describes criteria for ankle trauma patients to determine need for imaging.

Ottawa Foot Rule for the Use of X-Ray in Foot Injury Describes criteria for foot trauma patients to determine need for imaging.

Ottawa Knee Rule for use of X Ray in Knee Injury Describes criteria for knee trauma patients to determine need for imaging.

SI unit to conventional unit conversions: Chemistry and endocrine tests SI unit conversions for chemistries and endocrine tests.

SI unit to conventional unit conversions: Immunology test values Unit conversions for immunology tests.

WHO Assessment of Malnutrition in Boys 2 to 5 years Old WHO score for malnutrition based on age, height and weight.

WHO Assessment of Malnutrition in Girls 2 to 5 years Old WHO score for malnutrition based on age, height and weight.

WHO Infant Length for Age Percentiles (<24 months) WHO growth chart: length for age percentiles birth to 24 months.

WHO Infant Weight for Age Percentiles (<24 months) WHO growth chart: weight for age percentiles birth to 24 months.

Medical Statistics

Bayesian Statistics I MultiCalc Calculates statistics from prevalence, sensitivity, and specificity.

Bayesian Statistics II MultiCalc Calculates statistics from true and false positives and negatives.

Benefit Increase / Number Needed to Treat Multicalc Calculates absolute and relative benefit and number needed to treat.

Likelihood Ratio MultiCalc Estimates how much a test result will change the odds of having a disease.

Negative Predictive Value of a Test Probability with a negative screening test of not having the disease.

Odds Ratio and Relative Risk Calculates odds ratio and relative risk.

Positive Predictive Value of a Test Probability with a positive screening test of having the disease.

Post Test Probability from Pre Test Probability, Sensitivity and Specificity Post-test probability calculator for having a disease.

Post-Test Probability from Likelihood Ratios and Multiple Test Results Post-test probability calculator for having a disease.

Risk Reduction / Number Needed to Treat Multicalc Calculates risk reduction/number needed to treat.

Nephrology

Aminoglycoside Clearance Estimate Estimates rate of aminoglycoside clearance.

Anion Gap Aids in identifying causes of metabolic acidosis.

Anion Gap Delta Delta Gradient Multicalc Aids in identifying acid-base disorders.

Anion Gap Delta Delta Ratio Multicalc Aids in identifying acid-base disorders.

Anion Gap in Hypoalbumin States Calculation of anion gap (to identify acid-base disorders) taking hypoalbuminemia into account.

APACHE II scoring system Estimates ICU mortality.

Base Excess Determination Aids in identifying acid-base disorders.

Bicarbonate Deficit Calculates total bicarbonate deficit.