Body Surface Area Calculator
Calculate your body surface area in square meters using the Mosteller formula.
cm
kg
19.86 ft²
Mosteller
Formula
Examples
| Input | Result |
|---|---|
| 175 cm, 70 kg | BSA ≈ 1.84 m² |
About this calculator
Body surface area (BSA) estimates the total external area of the human body and is widely used in medicine, particularly for calculating drug dosages, chemotherapy regimens, and indexing measures like cardiac output. The Mosteller formula is the most popular method because it is simple, fast to compute, and accurate across a broad range of body sizes.
Because BSA reflects both height and weight, it often scales physiologic quantities better than weight alone. A typical adult BSA is around 1.6 to 2.0 m². Different formulas (Du Bois, Haycock, and others) can give slightly different results, so for clinical use always follow the specific method your protocol requires.
Frequently asked questions
Many physiologic functions scale more closely with surface area than body weight, so BSA can give a more consistent dose across patient sizes.
Mosteller is simpler and yields results very close to the older Du Bois formula across most body sizes, which is why it is widely preferred.
A typical adult value is roughly 1.7 m², with most adults falling between about 1.5 and 2.0 m².
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