Health & Fitness

Body Surface Area Calculator

The Body Surface Area Calculator computes body surface area in square meters from height in centimeters and weight in kilograms using the Mosteller formula.

What this calculator does

The Body Surface Area Calculator estimates your result instantly from the values you enter, using standard health & fitness formulas. The Body Surface Area Calculator computes body surface area in square meters from height in centimeters and weight in kilograms using the Mosteller 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.

Body Surface Area Calculator

Result

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BSA (Mosteller)

About Body Surface Area Calculator

Body surface area is often estimated with the Mosteller formula because it needs only height and weight. This tool takes the square root of height times weight divided by 3600.

Enter both measurements in metric units to get the BSA in square meters.

Formula & Mathematical Calculation

BSA (Mosteller) = f(Height (cm), Weight (kg))

Calculated according to standard health formulas implemented in the calculator core.

Calculation Example

For a height of 170 cm and weight of 70 kg: BSA = √(170 × 70 ÷ 3600) = √(11900 ÷ 3600) = √3.30556 ≈ 1.818 m².

Key Benefits

  • Uses the Mosteller formula, a simple square-root method for BSA.
  • Requires only height and weight, no other measurements.
  • Works entirely in metric units of centimeters and kilograms.
  • Reports the result in square meters to three decimals.

How to Use this Calculator

  1. Enter height
    Type your height in centimeters.
  2. Enter weight
    Type your weight in kilograms.
  3. Calculate and read
    Select Calculate and read the BSA (Mosteller) value 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

  • Body Surface Area 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

The Mosteller formula: the square root of height in cm times weight in kg divided by 3600.

Height in centimeters and weight in kilograms; the result is in square meters.

It is shown to three decimal places.

No; the Mosteller formula uses only height and weight.

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.