Estimate BSA from height and weight.
Free to use, no sign-up required. Body Surface Area is one of 198 tools built into Xenition, alongside a chat that can use them for you.
Estimates body surface area in square metres from height and weight. Clinicians use BSA to scale some drug doses and to index measures such as cardiac output.
The tool uses the Mosteller formula: BSA = √(height in cm × weight in kg ÷ 3600). It is an estimate for education, not medical advice, and dosing decisions belong to a clinician.
Height 175 cm and weight 70 kg give √(175 × 70 ÷ 3600) = √3.403, so 1.845 m². For 160 cm and 55 kg the result is about 1.563 m².
Around 1.9 m² for adult men and 1.6 m² for adult women, though it varies widely with size.
DuBois, Haycock, Mosteller and others were each fitted to different groups of people. Mosteller is widely used because it is simple and gives similar results for most adults.
You do not have to open Body Surface Area to use it. Ask Xenition in plain language and it runs the right tool, then carries the answer into whatever you are working on — a document, a spreadsheet, a deck.