Clinical Decision Tools
Medical Calculators
Instantly access 142 peer-reviewed clinical scoring tools.
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Wells Score for DVT
Clinical prediction rule for estimating the probability of deep vein thrombosis.
Wells Score for Pulmonary Embolism
Clinical prediction rule for estimating the probability of pulmonary embolism.
qSOFA Score
Quick Sepsis-related Organ Failure Assessment for identifying patients at risk of poor outcome.
CHA₂DS₂-VASc Score
Calculates stroke risk for patients with atrial fibrillation.
HAS-BLED Score
Estimates 1-year risk of major bleeding in patients with atrial fibrillation.
CURB-65 Pneumonia Severity Score
Estimates mortality of community-acquired pneumonia to help determine treatment setting.
HEART Score for Major Adverse Cardiac Events
Predicts 6-week risk of major adverse cardiac events (MACE) in patients with chest pain.
ABCD² Score for TIA
Estimates stroke risk after a transient ischemic attack (TIA).
SIRS Criteria
Systemic Inflammatory Response Syndrome criteria for identifying systemic inflammation.
TIMI Risk Score for NSTEMI/UA
Estimates mortality for patients with unstable angina or NSTEMI.
Glasgow Coma Scale (GCS)
Objective measure of consciousness level in patients with head injury or acute illness.
BMI Calculator
Calculates Body Mass Index (BMI).
Mean Arterial Pressure (MAP)
Calculates the average arterial blood pressure during a single cardiac cycle.
Ideal Body Weight (Devine Formula)
Estimates ideal body weight based on height and sex.
Maintenance IV Fluids (4-2-1 Rule)
Calculates hourly maintenance fluid rate using the Holiday-Segar method.
Anion Gap
Calculates the difference between measured cations and anions.
GFR (Cockcroft-Gault Equation)
Estimates creatinine clearance to approximate GFR.
Corrected QT Interval (QTc)
Calculates the heart-rate corrected QT interval (QTc) using the Bazett formula.
ASCVD Risk Estimator (2013)
Estimates 10-year risk of atherosclerotic cardiovascular disease.
Framingham Risk Score for CHD
Estimates 10-year risk of coronary heart disease.
MELD Score (Model for End-Stage Liver Disease)
Predicts survival for patients with end-stage liver disease.
Child-Pugh Score for Cirrhosis Mortality
Assesses the prognosis of chronic liver disease, mainly cirrhosis.
FENa (Fractional Excretion of Sodium)
Differentiates between prerenal and intrinsic renal causes of acute kidney injury.
Hunt & Hess Classification
Predicts mortality from subarachnoid hemorrhage (SAH).
Fisher Scale (SAH)
Predicts risk of cerebral vasospasm after subarachnoid hemorrhage (SAH).
Centor Criteria for Strep Throat
Predicts the probability of Group A Streptococcal (GAS) pharyngitis.
TIMI Risk Score for STEMI
Estimates 30-day mortality risk in patients with ST-elevation myocardial infarction (STEMI).
CRB-65 Score for Pneumonia Severity
Simplified version of CURB-65 that does not require laboratory tests.
APGAR Score
Quick assessment of a newborn baby health at 1 and 5 minutes after birth.
Simplified NIH Stroke Scale (sNIHSS)
A rapid assessment tool for stroke severity.
GFR (MDRD Equation)
Estimates GFR using the Modification of Diet in Renal Disease (MDRD) study equation.
Glasgow Alcoholic Hepatitis Score (GAHS)
Identifies patients with alcoholic hepatitis who are at high risk of death.
SOFA Score
Sequentially assesses organ failure in the ICU to predict mortality.
PSI/PORT Score
Pneumonia Severity Index for predicting mortality in community-acquired pneumonia.
APACHE II Score
Acute Physiology and Chronic Health Evaluation II for ICU mortality prediction.
CHADS₂ Score for Atrial Fibrillation
Estimates stroke risk in patients with atrial fibrillation.
Ottawa SAH Rule
Rule to rule out subarachnoid hemorrhage in patients with acute headache.
Body Surface Area (Mosteller)
Calculates Body Surface Area (BSA).
Adjusted Body Weight
Calculates adjusted body weight for dosing in obese patients.
eGFR (CKD-EPI 2021 Race-Free)
Estimates GFR using the 2021 race-free CKD-EPI equation.
Urinary Protein:Creatinine Ratio
Estimates 24-hour protein excretion from a spot urine sample.
Corrected Calcium
Corrects total calcium for albumin level.
Corrected Sodium (for Glucose)
Corrects sodium level in the presence of hyperglycemia.
Winter's Formula
Calculates expected PCO₂ in metabolic acidosis.
MELD-Na Score
Model for End-Stage Liver Disease (MELD) incorporating Sodium for liver transplant allocation.
BISAP Score
Bedside Index for Severity in Acute Pancreatitis. Predicts mortality risk.
Ranson's Criteria
Estimates mortality of patients with acute pancreatitis (Non-gallstone).
Rockall Score
Predicts mortality in patients with upper GI bleeding.
Glasgow-Blatchford Score (GBS)
Screens for upper GI bleed patients who need admission or endoscopic intervention.
AIMS65 Score
Predicts inpatient mortality in upper GI bleeding.
Harvey-Bradshaw Index (HBI)
Clinical index for evaluating Crohn's disease activity.
Mayo Score
Evaluates disease activity in Ulcerative Colitis (UC).
APACHE II for Pancreatitis
Acute Physiology and Chronic Health Evaluation II score for acute pancreatitis mortality.
Khorana Score
Predicts the risk of venous thromboembolism (VTE) in patients with cancer.
International Prognostic Index (IPI)
Predicts survival in patients with aggressive non-Hodgkin lymphoma (NHL).
Follicular Lymphoma IPI (FLIPI)
Predicts survival in patients with follicular lymphoma.
Revised IPI (R-IPI)
Predicts survival in DLBCL patients treated with Rituximab (R-CHOP).
Absolute Neutrophil Count (ANC)
Calculates the ANC to assess neutropenia risk.
SOKAL Score for CML
Provides prognostic information for patients newly diagnosed with Chronic Myeloid Leukemia (CML).
ECOG Performance Status
Assesses how a patient's disease is progressing and how it affects their daily living abilities.
STOP-BANG Score
Screens for Obstructive Sleep Apnea (OSA).
PERC Rule
Rules out Pulmonary Embolism (PE) in patients with a low pre-test probability.
Pulmonary Embolism Severity Index (PESI)
Predicts 30-day mortality in patients with acute pulmonary embolism.
Simplified PESI (sPESI)
A faster, simplified version of PESI to predict 30-day mortality in acute PE.
BODE Index for COPD
Predicts survival in patients with Chronic Obstructive Pulmonary Disease (COPD).
ARISCAT Score
Predicts the risk of postoperative pulmonary complications.
COPD Assessment Test (CAT)
Measures the impact of COPD on a person's life and how it changes over time.
Pregnancy Due Date Calculator
Estimates the expected date of delivery (EDD) based on the first day of the last menstrual period (LMP).
Gestational Age Calculator
Calculates the current gestational age based on LMP.
Bishop Score
Assesses cervical readiness for induction of labor.
VBAC Probability Calculator
Estimates the probability of a successful vaginal birth after cesarean (VBAC).
Preeclampsia Aspirin Prophylaxis Risk Assessment
Identifies pregnant patients at high risk for preeclampsia who may benefit from low-dose aspirin.
HELLP Syndrome Criteria
Evaluates laboratory criteria for Hemolysis, Elevated Liver enzymes, and Low Platelets (HELLP) syndrome.
PPH Risk Assessment Tool
Stratifies the risk of postpartum hemorrhage (PPH) prior to delivery.
Paediatric Glasgow Coma Scale (pGCS)
Assesses the depth and duration of impaired consciousness and coma in infants and children.
Paediatric BMI Tracking
Calculates Body Mass Index (BMI) for children. NOTE: Requires cross-referencing with standard WHO/CDC growth charts for true percentile.
Westley Croup Score
Classifies the severity of croup to guide treatment (e.g., steroids, nebulized epinephrine).
Clinical Dehydration Scale (CDS)
Assesses the severity of dehydration in children (usually from gastroenteritis).
Paediatric SIRS Criteria
Systemic Inflammatory Response Syndrome (SIRS) criteria for paediatric systemic inflammation.
PECARN Paediatric Head CT
Clinical decision tool for identifying children at low risk for clinically-important traumatic brain injury (ciTBI).
Holliday-Segar Fluids
Calculates maintenance fluid requirements for infants and children.
Patient Health Questionnaire-9 (PHQ-9)
Objectifies degree of depression severity.
Generalized Anxiety Disorder-7 (GAD-7)
Objectifies degree of severity of generalized anxiety disorder.
Patient Health Questionnaire-2 (PHQ-2)
An ultra-brief screening tool for depression.
AUDIT-C (Alcohol Use Disorders Identification Test)
Identifies hazardous drinkers or those with active alcohol use disorders.
CAGE Questionnaire for Alcohol Misuse
A classic, highly sensitive screening test for alcohol dependence.
CIWA-Ar for Alcohol Withdrawal Assessment
Quantifies the severity of alcohol withdrawal syndrome (AWS) to guide pharmacological dosing.
Columbia-Suicide Severity Rating Scale (C-SSRS)
Gold-standard triage tool to assess suicide risk and direct behavioral health interventions.
Ottawa Knee Rule
Determines the need for knee X-rays after acute knee injury.
Ottawa Ankle Rule
Determines the need for ankle and foot X-rays after acute ankle injury.
Canadian CT Head Rule
Identifies patients with minor head injury who require a CT scan.
NEXUS Criteria for C-Spine Imaging
Determines if cervical spine imaging is required following blunt trauma.
Alvarado Score for Appendicitis
Assesses the likelihood of acute appendicitis.
Appendicitis Inflammatory Response (AIR) Score
Classifies probability of appendicitis. Often outperforms Alvarado score by including CRP and precision grading of localized findings.
Manchester Triage System (MTS)
Standardized scale for triaging patients safely and managing emergency department flow.
Revised Trauma Score (RTS)
A robust physiological scoring system designed for triage of trauma patients.
PECARN Paediatric Abdominal Trauma
Identifies children at very low risk of intra-abdominal injuries undergoing blunt torso trauma.
HbA1c to eAG (Estimated Average Glucose)
Translates HbA1c percentage into estimated average blood glucose in mg/dL and mmol/L.
Diabetes Risk Score (FINDRISC)
Predicts the 10-year risk of developing type 2 diabetes.
DKA Severity Score
Classifies the severity of Diabetic Ketoacidosis (DKA).
Wayne's Thyroid Diagnostic Index
A clinical scoring system to differentiate euthyroid from toxic (hyperthyroid) patients based purely on clinical signs and symptoms.
HOMA-IR (Insulin Resistance)
Homeostatic Model Assessment of Insulin Resistance.
CKD Staging (KDIGO)
Classifies Chronic Kidney Disease (CKD) severity and prognosis risk using GFR and Albuminuria.
Protein:Creatinine Ratio (UPCR)
Estimates 24-hour urine protein excretion from a spot or random urine sample.
Urine Osmolality (Calculated)
Estimates urine osmolality based on primary urinary osmoles (Na, K, Urea, Glucose).
Steroid Equivalence Calculator
Converts doses between different systemic corticosteroids.
Fractional Excretion of Urea (FEUrea)
Evaluates Acute Kidney Injury (AKI) etiology when the patient is on diuretics (where FENa is inaccurate).
DAS28-CRP (Rheumatoid Arthritis)
Disease Activity Score 28 using CRP for Rheumatoid Arthritis assessment.
Crohn's Disease Activity Index (CDAI)
Calculates the severity of Crohn's disease.
ACR/EULAR 2010 RA Criteria
Classifies Rheumatoid Arthritis based on joint involvement, serology, acute phase reactants, and duration.
Gout Diagnostic Score
Diagnoses gout without joint aspiration in primary care settings.
ACR Criteria for SLE
1997 update of the 1982 revised ACR criteria for classification of Systemic Lupus Erythematosus.
Injury Severity Score (ISS)
An anatomical scoring system that provides an overall score for patients with multiple injuries.
FRAX Proxy (OST Score)
A validated clinical tool to assess the risk of osteoporosis using only age and weight.
Wells DVT — Post-surgical
Modified Wells score for deep vein thrombosis assessment specifically in post-operative patients.
Harris Hip Score
Assess the results of hip surgery and evaluates various hip disabilities.
KOOS — Knee Injury Score
Knee injury and Osteoarthritis Outcome Score to assess patient-relevant outcomes.
HIV Risk Assessment
A tool to assess the risk level following potential HIV exposure.
CURB-65 — Hospital CAP
Predicts mortality in community-acquired pneumonia (CAP) to determine inpatient vs outpatient management.
Fever Without Source — Paediatric
Screening for serious bacterial infection (SBI) in febrile infants.
Jones Criteria — Rheumatic Fever
Revised criteria for the diagnosis of Acute Rheumatic Fever.
Duke Criteria — Endocarditis
Standard diagnostic criteria for Infective Endocarditis.
Bacterial vs Viral Meningitis
Helps distinguish bacterial from viral meningitis in children.
ACS NSQIP Risk Calculator
A simplified assessment of surgical risk for postoperative complications.
STOP-BANG — Sleep Apnea
Screening tool for Obstructive Sleep Apnea (OSA).
Goldman Index — Cardiac Risk
The Original multifactorial index of cardiac risk in non-cardiac surgery.
RCRI — Revised Cardiac Risk
Lee’s Revised Cardiac Risk Index for predicting major cardiovascular complications.
Alvarado Score (Post-op)
Scoring system for suspected acute appendicitis, reused in post-operative contexts to evaluate recurrent or missed disease.
ASA Physical Status
The American Society of Anesthesiologists (ASA) Physical Status Classification System for assessing preoperative physical status.
POSSUM Score
Physiological and Operative Severity Score for the enUmeration of Mortality and morbidity.
Steroid Equivalence
Converts doses between different systemic corticosteroids based on anti-inflammatory potency.
Temperature
Converts between Celsius and Fahrenheit.
Weight / Mass
Converts between Kilograms (kg) and Pounds (lbs).
Length / Height
Converts between Centimeters (cm), Inches (in), and Feet (ft).
Liquid Volume
Converts between Liters (L), Fluid Ounces (fl oz), and Cups.
HbA1c to eAG
Converts HbA1c percentage to Estimated Average Glucose (eAG) in mg/dL or mmol/L.
Lab Unit Conversion
Generic laboratory unit conversion tool.
BSA Calculation
Calculates Body Surface Area (BSA) using the Mosteller formula.
WHO Severe Malaria Criteria
Defines severe malaria per WHO 2023 guidelines for management priority.
Malaria Severity Score (Paediatric)
Clinical scoring tool for predicting mortality in children with severe malaria.
TB Risk Stratification
Screening tool for tuberculosis using the standardized WHO symptom complex.
MDR-TB Risk Score
Identifies patients with higher probability of multidrug-resistant tuberculosis.
HIV WHO Clinical Staging
Clinically stages HIV to determine disease progression when CD4 is unavailable.
CD4 Count Interpretation
Interprets CD4 results to guide OI prophylaxis (e.g. Cotrimoxazole, Fluconazole).
Sickle Cell Crisis Severity
Assesses the severity of Vaso-Occlusive Crisis (VOC) and risk of Acute Chest Syndrome.
Maternal Mortality Risk (SSA)
Triage tool for identifying mothers at highest risk for mortality in resource-limited settings.
Eclampsia Risk Score
Determines the probability of progression from preeclampsia to eclampsia (seizures).
Severe Acute Malnutrition (SAM)
Uses MUAC and edema findings to diagnose severe childhood malnutrition.
Typhoid Severity Score
Assesses severity and complication risk in Salmonella Typhi infection.
Dengue Severity (WHO 2009)
Classifies dengue into Dengue, Dengue with Warning Signs, or Severe Dengue.
Bilharzia Risk Index
Predicts the likelihood of Schistosomiasis based on exposure and symptoms.
Neonatal Sepsis Risk Score
Screening tool for early-onset neonatal sepsis in African hospitals.
Cholera Dehydration Score
Standardized WHO dehydration assessment for patients with profuse watery diarrhea.