What is BSA used for?

Doctors use it to calculate doses for some treatments, such as certain chemotherapy drugs, and to interpret some measurements.

Which formula is most common?

Mosteller, because it is simple: √(height in cm × weight in kg ÷ 3600).

Should I use this to work out a dose?

No. Only a clinician should calculate a medicine dose.

All tools

Body Surface Area Calculator

Enter your height and weight to get your body surface area using four common clinical formulas.

Height & Weight

Height (cm)

Weight (kg)

Body surface area in m² from height and weight using the Mosteller, Du Bois, Haycock and Gehan-George clinical formulas.

Formula

Mosteller: BSA = √(height(cm) × weight(kg) ÷ 3600). Du Bois: 0.007184 × H^0.725 × W^0.425.

Reference Values

•Most adults: 1.6–2.0 m²
•Mosteller is the most widely used
•Formulas agree within ~3%

FAQ

Common questions about Body Surface Area Calculator

How we calculate this

We use the standard published formula for this calculation, and we show the working so you can check it.

Spotted a mistake? Tell us and we'll check it within a few days. See how we check our calculators.

Medical disclaimer

This tool gives a general estimate for information only. It is not medical advice and cannot diagnose a condition. Talk to a doctor, midwife or other qualified professional about your own situation.