An average adult
175 cm and 70 kg: Mosteller 1.84 m², Du Bois 1.85 m², Haycock 1.85 m².
Body Surface Area Calculator
Calculate body surface area in m² with the Mosteller, Du Bois and Haycock formulas.
Result
Enter your values and select Calculate to see the result.
Result
Enter your values and select Calculate to see the result.
Runs in your browser — nothing you enter is sent to a server.
How the Body Surface Area Calculator works
Body surface area (BSA) is the total area of the skin, estimated from height and weight. It's used in medicine, for example to scale some drug doses and heart measurements. The calculator gives the three most used formulas; they agree closely for most adults.
Formulas
Mosteller
BSA = √(height (cm) × weight (kg) ÷ 3600)
Du Bois
BSA = 0.007184 × weight0.425 × height0.725
Haycock
BSA = 0.024265 × weight0.5378 × height0.3964
Examples
Typical values
Most adults are between about 1.6 and 2.0 m².
Frequently asked questions
Which formula should I use?
Mosteller is the simplest and most used today; Du Bois is the oldest (1916); Haycock is often used for children. Follow the formula your clinic or study uses.
Can I use it to work out a medicine dose?
No. Doses must always come from a doctor or pharmacist.
Does it work in pounds and inches?
Yes — choose US units and the values are converted first.
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