BSA Calculator
Calculate body surface area in square meters from height and weight using a standard medical formula.
What this calculator does
The BSA Calculator estimates your result instantly from the values you enter, using standard health & fitness formulas. Calculate body surface area in square meters from height and weight using a standard medical formula. Calculations run in your browser, so nothing you type is sent to a server, and the output is an estimate rather than a certified or official figure.
Result
About BSA Calculator
The BSA Calculator estimates body surface area from height in centimeters and weight in kilograms. It reports two results: the Mosteller estimate and the Du Bois estimate.
Both inputs must be positive. The calculator rounds each result to at most three decimal places and displays the area in square meters.
Formula & Mathematical Calculation
Mosteller BSA = √[(Height in cm × Weight in kg) ÷ 3600]
Du Bois BSA = 0.007184 × Height0.725 × Weight0.425
Both results are areas in square meters and are rounded by the calculator to at most three decimal places.
Calculation Example
Example: At 170 cm and 70 kg, the Mosteller result is 1.818 m2. The Du Bois result is 1.81 m2 after the calculator rounds and removes trailing zeros.
Key Benefits
- Calculates both Mosteller and Du Bois estimates
- Uses metric height and weight inputs
- Shows both estimates side by side
- Rounds results to at most three decimal places
How to Use this Calculator
-
Enter height
Provide a positive height in centimeters. -
Enter weight
Provide a positive weight in kilograms. -
Compare the estimates
Review the Mosteller and Du Bois body-surface-area results in square meters.
Assumptions & Limitations
What the calculation assumes
- Every value you enter is treated as an exact, known amount.
- Any rate or interval you enter is assumed to hold for the whole period unless the form asks for it separately.
- Results use standard published formulas and account only for the values entered above.
- Rounding is applied for display; the underlying calculation uses your full precision.
- Results are returned in the same units you enter, unless the tool states the output unit.
What it does not cover
- BSA Calculator produces a calculated result for reference and learning, not a certified or official measurement.
- Real-world outcomes differ when tolerances, rounding rules or local standards apply.
- Definitions and standards vary by region and change over time; verify the convention that applies to your case.
- Figures are only as accurate as the inputs you supply — check them before acting on the result.
- For work where the result carries real consequences, confirm it against an authoritative source.
Frequently Asked Questions
Free to use, no account needed. Calculations run in your browser, so nothing you type is sent to a server. Results are estimates — how we build and check our calculators.