BSA Calculator — Du Bois, Mosteller & More

How to use

1. Pick metric (cm + kg) or imperial (ft-in + lb) units.
2. Enter your height and weight.
3. Press Calculate BSA to see Du Bois and Mosteller headline values.
4. Compare all four formulas in the results table.

General information only — not medical, financial or legal advice. Figures cross-checked against public official sources (IRS / HMRC / NHS / WHO guidance); content last reviewed September 2026. For decisions that matter, confirm with a licensed professional in your country.

About this tool

Body surface area (BSA) is how oncologists dose chemotherapy, how cardiologists normalize cardiac output, and how burn units size injuries. This calculator computes your BSA in square meters with the two formulas you will meet most often — Du Bois (1916), still the most-cited dosing standard, and Mosteller, the simple square-root version many hospitals prefer — plus Haycock and Gehan-George for comparison, so you can see how closely the methods agree. Enter height and weight in metric (cm/kg) or imperial (ft-in/lb); the toggle converts everything for you. Typical adults land near 1.6–1.9 m². All math runs locally in your browser. BSA figures here are an educational estimate, not medical advice: formulas can overestimate in obesity, and actual chemotherapy dosing always follows your oncology team's protocol.

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