BSA calculator

Mosteller body surface area (square meters) = square root of height in cm times weight in kg divided by 3,600.

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Height (centimeters)

Weight (kilograms)

Answer

…

Mosteller body surface area (square meters) = square root of height in cm times weight in kg divided by 3,600.

More results

Precision and calculation record

Decimal places in numeric results and text downloads

Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

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Formula and assumptions

A body-surface-area approximation, not a measurement or a medicine dose. This tool accepts adult-sized inputs and does not supply pediatric dosing, burn-area estimates or treatment decisions. A clinician must choose the formula and interpretation for clinical use.

Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

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Updated 2026-09-29

Using BSA calculator

Mosteller body surface area (square meters) = square root of height in cm times weight in kg divided by 3,600.

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Next: Calorie calculator

A worked example

For height (centimeters) = 180, weight (kilograms) = 80, body surface area (square meters) = 2.

Before you use the result

Example results for height (centimeters)

These examples use Weight (kilograms): 80. They are reference calculations, not recommended settings.

Height (centimeters)	Body surface area (square meters)
90	1.414214
180	2

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