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Body Surface Area Calculator

Enter height and weight to compare two common body-surface-area estimates. Formula results can differ; this is math information, not medical guidance.

Adult estimate only. Supported range: 50–250 cm and 10–500 kg, including equivalent US units.

Do not use these estimates for medication doses, diagnosis or treatment decisions. Follow a qualified healthcare professional’s instructions. Not intended for children.

Mosteller: √(height cm × weight kg ÷ 3,600). Du Bois: 0.007184 × weight kg^0.425 × height cm^0.725. Results are estimates, not direct measurements.

How is body surface area estimated?

Mosteller uses the square root of height in centimeters times weight in kilograms divided by 3,600. Du Bois uses a different height-and-weight equation. Both return an estimate in square meters.

Frequently asked questions

How is body surface area estimated?

Mosteller uses the square root of height in centimeters times weight in kilograms divided by 3,600. Du Bois uses a different height-and-weight equation. Both return an estimate in square meters.

Are my measurements uploaded?

No. The estimates run in this browser. Measurements are not saved or uploaded.

Why do the formulas give different results?

Each formula models height and weight differently. The displayed difference is arithmetic, not a measure of which formula is right for a particular person.

Can I use body surface area to calculate a medicine dose?

No. Do not use this page to choose or change a dose. Use only instructions from a qualified healthcare professional.

Does this calculator work for children?

No. It is presented only as an adult estimate and does not implement pediatric formulas or clinical interpretation.