Health & FitnessFormula-based · Runs in your browser

Body Surface Area Calculator

Calculate body surface area with Mosteller, Du Bois, Haycock, Gehan–George, Boyd, and Schlich formulas.

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Inputs

Enter the values you know. Optional fields may be left empty.

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Required
Required
Required
kg
Required
cm

Result

Updates as valid inputs change.

Calculated locally
BSA is an estimate. Clinical dosing or treatment decisions require professional verification.
Mosteller BSA
Du Bois BSA
Haycock BSA
Gehan–George BSA
Boyd BSA
Schlich BSA
Formula average

Saved locally, explained clearly

Drafts, calculations, scenarios, and workflow progress stay in this browser unless you export them.

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Calculation steps

Follow what happened from the selected formula to the displayed answer.

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Calculate current inputs to see the working.
  1. 1

    Formula selected

    The calculator uses the following formula or method.

    Mosteller: √(height cm × weight kg ÷ 3600); other published equations use formula-specific powers of height and weight.

  2. 2

    Values entered

    Your values are placed into the calculation.

    Enter values to see what is used in this step.

  3. 3

    Result calculated

    The formula or method produces the following result values.

    Results will appear after a successful calculation.

  4. 4

    Answer formatted

    Displayed values are rounded and formatted using each output’s configured precision.

Scenario comparison

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Recent calculations

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Data and privacy

How it works

Body surface area is commonly used as a size-normalization estimate. The calculator displays six published equations because their results are not identical, especially at unusual body sizes.

Input query strings and outputs

Use an input name in this page’s URL as ?name=value, and join additional inputs with &. Portable shared links may instead use the compact ?ac= state parameter.

Input query strings

7
  • ?unitSystem= Units

    Choice · Required · Default: metric · Accepted values: metric, imperial

  • ?sex= Sex used by equation

    Choice · Required · Default: male · Accepted values: male, female

  • ?weightKg= Weight

    Number · Required · Default: 70 · Used when unitSystem = metric

  • ?heightCm= Height

    Number · Required · Default: 175 · Used when unitSystem = metric

  • ?weightLb= Weight

    Number · Required · Default: 154 · Used when unitSystem = imperial

  • ?feet= Height feet

    Number · Required · Default: 5 · Used when unitSystem = imperial

  • ?inches= Height inches

    Number · Required · Default: 9 · Used when unitSystem = imperial

Outputs

7
  • mosteller Mosteller BSA

    Number · Primary output · Suffix: m²

  • duBois Du Bois BSA

    Number · Suffix: m²

  • haycock Haycock BSA

    Number · Suffix: m²

  • gehanGeorge Gehan–George BSA

    Number · Suffix: m²

  • boyd Boyd BSA

    Number · Suffix: m²

  • schlich Schlich BSA

    Number · Suffix: m²

  • average Formula average

    Number · Suffix: m²

Clinical limit

Do not use an unverified web-calculator result as the sole basis for medication dosing or treatment.

Sources
Limitations
  • BSA is an estimate. Clinical dosing or treatment decisions require professional verification.
  • Health results are educational estimates, not a diagnosis or treatment recommendation. Individual circumstances may require a qualified clinician's assessment.