Body surface area, or BSA, is the estimated total surface of the human body in square metres and is often used to scale medication doses and physiological measurements. This calculator gives two established estimates so you can compare them. The Mosteller formula takes the square root of height times weight divided by 3600, and is popular because it is easy to compute. The Du Bois formula uses a power law on height and weight and was one of the earliest widely adopted methods. Enter height in centimetres and weight in kilograms, and both results appear in square metres, where a typical adult falls near 1.7. Everything is calculated locally in your browser with no data sent anywhere. BSA figures here are for general information and study, not medical dosing decisions, which should always be made by a qualified clinician.
It shows the Mosteller and Du Bois formulas side by side, two widely used ways to estimate body surface area.
BSA is used in medicine to scale things like drug doses and physiological measures to body size, more accurately than weight alone.
The area is given in square metres, the standard unit for body surface area.
Body surface area, or BSA, is the estimated total surface of the human body in square metres and is often used to scale medication doses and physiological measurements. This calculator gives two established estimates so you can compare them.
Yes. Body Surface Area Calculator is completely free, with no sign-up and no usage limits.
Yes. Body Surface Area Calculator runs in any modern web browser. There is nothing to download or install.
Yes. Body Surface Area Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.