Health calculator
Body Surface Area Calculator
Estimate body surface area from height and weight using common adult formulas.
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.
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?+
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?+
Estimate body surface area from height and weight using common adult formulas.
How accurate is the Body Surface Area Calculator?+
Body Surface Area Calculator applies the formula and assumptions shown on this page. Results may be rounded for readability, so verify changing rates, thresholds, medical guidance, or legal rules with the cited source or a qualified professional.
What should I check before using the Body Surface Area Calculator result?+
Check that the units, dates, rates, and assumptions match your situation. Change one input at a time to understand which values have the largest effect on the result.
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
Enter your details
Enter height and weight using common adult formulas, then complete any other fields shown in the calculator.
- 2
Check the calculation
Review the result alongside the mosteller BSA formula: BSA = sqrt(height(cm) x weight(kg) / 3600).
- 3
Compare scenarios
Change one or more inputs to see how they affect the body Surface Area Calculator result before you use the estimate.
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