All Medical Calculators

Browse 50 free medical calculators by category. Each tool includes the formula, interpretation notes, references, and related calculators for quick cross-checking.

General Medical Calculators

General medical calculators for body size, dosing support, lab interpretation, fluids, and unit conversion.

9 calculators

BMI Calculator (Body Mass Index)Calculate Body Mass Index from weight and height.Corrected Calcium CalculatorCorrect serum calcium for albumin level.Anion Gap CalculatorCalculate serum anion gap from electrolytes.Ideal Body Weight CalculatorCalculate ideal body weight using the Devine formula.Maintenance IV Fluid Rate (4-2-1 Rule)Calculate maintenance IV fluid rate using the 4-2-1 rule.Body Surface Area (BSA) CalculatorCalculate body surface area using Du Bois or Mosteller formula.IV Drip Rate CalculatorCalculate IV infusion rate in mL/hr and drops per minute.Lab Unit Converter (mg/dL ↔ mmol/L)Convert between conventional and SI lab units for common substances.Adjusted Body Weight CalculatorCalculate adjusted body weight for drug dosing in obese patients.

Renal Calculators

Kidney function and renal lab calculators including eGFR, creatinine clearance, osmolality, UPCR, and sodium correction.

7 calculators

eGFR Calculator (CKD-EPI 2021)Estimate glomerular filtration rate using the CKD-EPI equation.Creatinine Clearance Calculator (CrCl, Cockcroft-Gault)Estimate creatinine clearance using the Cockcroft-Gault formula.Sodium Correction for HyperglycemiaCorrect sodium for elevated glucose levels.Serum Osmolality CalculatorCalculate serum osmolality and osmolar gap.Kt/V (Dialysis Adequacy)Assess hemodialysis adequacy using the Daugirdas formula.Urine Protein-Creatinine Ratio (UPCR) CalculatorEstimate 24-hour urine protein from a spot urine sample.Albumin-Corrected Anion GapCalculate albumin-corrected anion gap and delta-delta ratio.

Cardiac Calculators

Cardiology calculators for ASCVD risk, QTc, GRACE, CHA2DS2-VASc, HAS-BLED, MAP, and perioperative cardiac risk.

7 calculators

QTc Calculator (Bazett, Fridericia)Calculate corrected QT interval with Bazett, Fridericia, Framingham, and Hodges formulas.ASCVD Risk CalculatorEstimate 10- and 30-year ASCVD risk with the AHA PREVENT equations.Mean Arterial Pressure (MAP) CalculatorCalculate mean arterial pressure from systolic and diastolic BP.CHA₂DS₂-VASc ScoreAssess stroke risk in patients with atrial fibrillation.Revised Cardiac Risk Index (RCRI)Estimate risk of major cardiac events after non-cardiac surgery.GRACE Score CalculatorEstimate in-hospital mortality risk in acute coronary syndromes.HAS-BLED Bleeding Risk CalculatorAssess bleeding risk in atrial fibrillation patients on anticoagulation.

Pulmonary Calculators

Pulmonary and blood gas calculators including alveolar gas equation and A-a gradient.

2 calculators

A-a Gradient CalculatorCalculate alveolar-arterial oxygen gradient.Alveolar Gas Equation CalculatorCalculate alveolar partial pressure of oxygen (PAO₂).

Hepatic Calculators

Liver disease calculators including MELD, MELD-Na, and Child-Pugh scoring.

2 calculators

MELD & MELD-Na Score CalculatorCalculate Model for End-Stage Liver Disease score with sodium.Child-Pugh ScoreClassify severity of chronic liver disease and cirrhosis.

Vascular Risk Calculators

Vascular and cardiovascular risk calculators including Framingham risk scoring.

1 calculators

Framingham Risk CalculatorEstimate 10-year cardiovascular disease risk.

Emergency Calculators

Emergency medicine calculators including Wells score for PE and CURB-65 pneumonia severity.

2 calculators

Wells Score Calculator for PEEstimate probability of pulmonary embolism using Wells criteria.CURB-65 ScoreAssess severity of community-acquired pneumonia.

Emergency and ICU Calculators

Emergency and ICU calculators including APACHE II, SOFA, qSOFA, GCS, shock index, and burn formulas.

11 calculators

GCS Calculator (Glasgow Coma Scale)Calculate Glasgow Coma Scale from eye, verbal, and motor responses.APACHE II CalculatorEstimate ICU mortality risk using the APACHE II scoring system.SOFA Score CalculatorAssess organ dysfunction severity using the SOFA score.SIRS CriteriaEvaluate systemic inflammatory response syndrome criteria.Burns BSA — Rule of NinesEstimate total body surface area burned using the Rule of Nines.Parkland Formula (Burns Fluid Resuscitation)Calculate fluid resuscitation for burn patients using the Parkland formula.Shock Index CalculatorCalculate shock index from heart rate and systolic blood pressure.qSOFA ScoreQuick bedside screening for sepsis risk using the qSOFA score.RASS (Richmond Agitation-Sedation Scale)Assess ICU patient sedation and agitation level using RASS.BISAP Score (Pancreatitis Severity)Predict mortality in acute pancreatitis using the BISAP score.PSI (Pneumonia Severity Index)Stratify pneumonia severity to guide disposition decisions.

Neurology Calculators

Neurology calculators including NIHSS, ABCD2, Hunt-Hess, and Glasgow Coma Scale related tools.

3 calculators

NIHSS Calculator (NIH Stroke Scale)Quantify stroke severity using the NIH Stroke Scale.Hunt-Hess Scale (SAH)Classify subarachnoid hemorrhage severity using the Hunt-Hess scale.ABCD² Score (TIA)Predict short-term stroke risk after transient ischemic attack.

Endocrine Calculators

Endocrine calculators including HbA1c to eAG conversion and thyroid function interpretation.

2 calculators

HbA1c Calculator (A1c to eAG)Convert HbA1c/A1c to estimated average glucose (eAG).TSH Interpreter (Thyroid Function)Interpret thyroid function from TSH and free hormone levels.

Pediatric Calculators

Pediatric calculators for weight estimation, weight-based dosing, dehydration assessment, and body surface area.

3 calculators

Pediatric Weight CalculatorEstimate pediatric weight using APLS and Luscombe formulas.Pediatric Dosing CalculatorCalculate weight-based doses for common pediatric medications.Pediatric Dehydration AssessmentAssess dehydration severity in children using clinical signs.

Hematology Calculators

Hematology calculators including absolute neutrophil count and related blood count interpretation tools.

1 calculators

Absolute Neutrophil Count (ANC)Calculate absolute neutrophil count from CBC differential.