Health calculator

Body Surface Area Calculator

Estimate body surface area from height and weight using common adult formulas.

FormulaBSA = sqrt(height(cm) x weight(kg) / 3600)

Formula

Mosteller BSA formula

BSA is a clinical estimate. Medical dosing and treatment decisions should be made by qualified professionals.

BSA = sqrt(height(cm) x weight(kg) / 3600)

A person who is 170 cm and 70 kg has BSA = sqrt(170 x 70 / 3600), about 1.82 sq m.

FAQ6 common questions for this calculator.

FAQs

Which BSA formula is used?+

The main result uses the Mosteller formula and also shows a Du Bois estimate for comparison.

Is BSA the same as BMI?+

No. BSA estimates body surface area, while BMI compares weight to height squared.

How does the Body Surface Area Calculator calculate the result?+

For the Body Surface Area Calculator, it uses the Mosteller BSA formula: BSA = sqrt(height(cm) x weight(kg) / 3600). A person who is 170 cm and 70 kg has BSA = sqrt(170 x 70 / 3600), about 1.82 sq m.

What information do I need to use the Body Surface Area Calculator?+

For the Body Surface Area Calculator, enter height and weight. Keep the units consistent with the calculator fields and compare your setup with the worked example on the page.

How accurate is the Body Surface Area Calculator?+

Body Surface Area Calculator is only as accurate as the height and weight entered. It applies the Mosteller BSA formula shown on this page, then rounds for readability. Treat the output as screening guidance rather than a diagnosis.

What should I check before using the Body Surface Area Calculator result?+

For the Body Surface Area Calculator, check height and weight, unit choices, and whether the calculator's assumptions fit the person being assessed. Use the result as screening or planning context, not as a diagnosis.

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Health guide

How to use the Body Surface Area Calculator

Estimate body surface area from height and weight using common adult formulas. The page also explains the mosteller BSA formula and shows a practical example: A person who is 170 cm and 70 kg has BSA = sqrt(170 x 70 / 3600), about 1.82 sq m.

  1. 1

    Enter your details

    Enter height and weight using common adult formulas, then complete any other fields shown in the calculator.

  2. 2

    Check the calculation

    Review the result alongside the mosteller BSA formula: BSA = sqrt(height(cm) x weight(kg) / 3600).

  3. 3

    Compare scenarios

    Change one or more inputs to see how they affect the body Surface Area Calculator result before you use the estimate.