FREE CLINICAL CALCULATORSBrowser-based. No sign-up.
Health calculators.
Built for understanding.
Five practical tools with transparent formulas, worked examples, and the context behind each result.
Anion Gap Calculator
Evaluate the difference between measured cations and anions.
Na − (Cl + HCO₃)02ElectrolytesCorrected Calcium Calculator
Estimate total calcium adjusted for albumin concentration.
Ca + 0.8 × (4 − albumin)03Kidney functionFENa Calculator
Calculate fractional excretion of sodium from paired samples.
(UNa × PCr) / (PNa × UCr) × 10004Body measurementsAdjusted Body Weight Calculator
Compare actual, ideal, and adjusted body weight.
IBW + 0.4 × (actual − IBW)05Body measurementsLean Body Mass Calculator
Compare the Boer, James, and Hume estimates.
Three established estimation formulas