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Body Surface Area Calculator

Estimate body surface area using several common formulas and compare the spread between methods.

BSA formulas are estimates. For medication dosing or clinical decisions, use the method specified by the clinician, protocol or product label.

Method

Mosteller uses the square root of height times weight divided by 3600. Du Bois and Haycock are included because BSA formula choice can matter in clinical contexts.

Example

For 175 cm and 75 kg, the Mosteller formula gives sqrt(175 x 75 / 3600), or about 1.91 m2.

Common mistakes

Use centimeters and kilograms for the metric formulas shown. Do not use a BSA estimate for medication dosing unless the clinical protocol calls for that formula.

Limitations

This page does not recommend a dosing method. Always follow the formula specified in the relevant clinical protocol or medication label.

References

Last reviewed: 2026-05-17

Before relying on this result

Use this calculator together with the formula, assumptions, limitations and examples on the page. If the topic involves health, tax, lending, investment, legal, safety or current-rate decisions, treat the number as an estimate and check the relevant primary source or professional guidance.

Calculator metadata last reviewed: 2026-05-14.