All Tools VerseBody Surface Area Calculator
Calculate body surface area in square meters using Mosteller, Du Bois, Haycock and Gehan-George formulas. Runs in your browser.
- Runs in your browser
- Nothing uploaded
- Free, no sign-up
Calculate your body surface area in square meters from your height and weight, using four standard formulas. BSA is used in medicine to scale drug doses and other measures. Runs in your browser.
Loading chart...
| Formula | BSA (m²) |
|---|
Mosteller is the most widely used formula because it is simple and accurate. The others are shown for comparison. BSA is a clinical estimate; follow your care team's method for any medical use.
How to Use Body Surface Area Calculator
- Choose your units. Pick metric or imperial for your height and weight.
- Enter height and weight. Type your measurements into the two fields.
- Read your BSA. See your body surface area from the Mosteller formula, with the others for comparison.
- Compare the formulas. The table and chart show how each method lands, usually within a small range.
Frequently Asked Questions
What is body surface area?
Body surface area, or BSA, is the total surface of the body in square meters. It is used in medicine to scale drug doses and other clinical measures.
Which formula should I use?
Mosteller is the most common because it is simple and accurate, using the square root of height times weight divided by 3600. The tool highlights it by default.
Why do the formulas differ slightly?
Each was derived from different data, so they give marginally different values. For most people they agree within a couple of percent.
What is a typical BSA?
An average adult is roughly 1.7 to 2.0 square meters, though it varies with height and weight.
Can I use this for medication doses?
Treat it as a reference only. Any clinical dosing should follow your care team’s method and judgement.
Is my data uploaded?
No. The calculation runs entirely in your browser.
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