eGFR Calculator
Estimated GFR with the race-free CKD-EPI 2021 equations and CKD stage.
Medical & Clinical Tools
33 free tools
Clinical calculators for education and decision support: eGFR, creatinine clearance, electrolytes, QTc and blood gases, lab unit converters, drug dosing and pharmacokinetics, and epidemiology rates.
All 33 medical & clinical tools
Creatinine Clearance Calculator
Cockcroft–Gault creatinine clearance with actual, ideal and adjusted weight.
Corrected Calcium Calculator
Albumin-corrected calcium in mg/dL or mmol/L.
Corrected Sodium Calculator
Sodium corrected for high glucose with the Katz and Hillier formulas.
Anion Gap Calculator
Anion gap, albumin-corrected gap and delta ratio.
Serum Osmolality Calculator
Calculated serum osmolality and osmolal gap.
Body Surface Area Calculator
BSA with the Mosteller, DuBois, Haycock, Gehan–George and Boyd formulas.
Adjusted Body Weight Calculator
Ideal, adjusted and lean body weight for drug dosing.
QTc Calculator
Corrected QT interval with the Bazett, Fridericia, Framingham and Hodges formulas.
Mean Arterial Pressure Calculator
MAP and pulse pressure from systolic and diastolic blood pressure.
Shock Index Calculator
Shock index, modified shock index and age shock index.
P/F Ratio Calculator
PaO₂/FiO₂ ratio with Berlin ARDS severity and SpO₂/FiO₂.
A–a Gradient Calculator
Alveolar–arterial oxygen gradient with the age-expected value.
Medical Lab Unit Converter
Convert 30 lab tests between conventional and SI units.
Blood Glucose Converter
Convert blood sugar between mg/dL and mmol/L.
Cholesterol Unit Converter
Convert cholesterol and triglycerides between mg/dL and mmol/L.
Creatinine Unit Converter
Convert creatinine between mg/dL and µmol/L.
HbA1c Converter
Convert HbA1c between %, mmol/mol and estimated average glucose.
Drug Dose Calculator
Weight-based (mg/kg) and BSA-based (mg/m²) doses with volume to give.
Drug Dilution Calculator
Solve C₁V₁ = C₂V₂ for stock volume, diluent, final concentration or volume.
IV Infusion Rate Calculator
IV rates in mL/h and drops/min, including weight-based drips.
Drug Half-Life Calculator
Elimination half-life, rate constant and amount remaining over time.
Pharmacokinetic Calculator
Non-compartmental Cmax, Tmax, AUC, half-life, clearance and volume.
Loading Dose Calculator
Loading dose from target concentration, volume of distribution and bioavailability.
Maintenance Dose Calculator
Maintenance dose from clearance, target concentration and dosing interval.
Incidence Calculator
Cumulative incidence (risk) with an exact confidence interval.
Person-Time Incidence Rate Calculator
Incidence rate per person-years with an exact Poisson interval.
Prevalence Calculator
Point or period prevalence with confidence interval, or from incidence and duration.
Attack Rate Calculator
Attack rates, secondary attack rate and exposure comparison for outbreaks.
Mortality Rate Calculator
Crude, cause-specific, infant and maternal mortality rates with CIs.
Case Fatality Rate Calculator
Case fatality rate with confidence interval and CFR among resolved cases.
Attributable Risk Calculator
Risk difference and attributable fraction among the exposed.
Population Attributable Risk Calculator
Population attributable risk and fraction with Levin's and Miettinen's formulas.
Practical guides
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How to Use eGFR Calculator
Estimate GFR with the race-free CKD-EPI 2021 creatinine and creatinine–cystatin C equations, compare with MDRD and see the CKD stage from G1 to G5.
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How to Use Creatinine Clearance Calculator
Calculate Cockcroft–Gault creatinine clearance with actual, ideal and adjusted body weight for renal drug dosing, in mg/dL or µmol/L creatinine.
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How to Use Corrected Calcium Calculator
Correct total serum calcium for low albumin with Payne’s formula in mg/dL or mmol/L, and see whether the corrected value is low, normal or high.
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How to Use Corrected Sodium Calculator
Correct serum sodium for high blood glucose with the Hillier (2.4) and Katz (1.6) factors to reveal true hyponatremia or hidden hypernatremia.
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How to Use Anion Gap Calculator
Calculate the serum anion gap, the albumin-corrected gap and the delta ratio to classify metabolic acidosis and spot mixed acid–base disorders.
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How to Use Serum Osmolality Calculator
Calculate serum osmolality from sodium, glucose, urea and ethanol in mg/dL or mmol/L, and the osmolal gap from a measured value to screen for toxins.
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