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Body Surface Area Calculator
Estimate body surface area from height and weight using the Mosteller formula, a common clinical method for BSA calculation.
Body surface area
2.01 m²
Square feet
21.61 ft²
How to Use
- Enter body weight in pounds and height in feet and inches so the calculator can estimate overall body size using the standard Mosteller approach.
- Review the result in square meters first, because that is the unit most often used when BSA appears in medical and reference contexts.
- Use the square-feet value only as a secondary reference if that unit is easier for your own comparison or documentation needs.
- Treat the result as an estimate of body size, not a measure of health, body fat, or fitness. BSA answers a different question than BMI or body composition tools.
- If you are using BSA as part of a clinical decision, medication discussion, or treatment plan, confirm the inputs and follow professional guidance rather than relying on a quick estimate alone.
Frequently Asked Questions
What is body surface area?
Body surface area estimates the total external surface of the human body, usually expressed in square meters. It is a size-based metric rather than a health score.
Why is BSA used?
BSA is used in some clinical settings, research references, and body-size comparisons where total surface area is more relevant than body weight alone. It is one of several ways to normalize measurements across differently sized people.
Which formula does this calculator use?
This calculator uses the Mosteller formula, a widely used method because it is simple, fast, and generally practical for routine estimation from height and weight.
Is BSA the same as BMI?
No. BMI relates weight to height and is often used as a rough weight-status screening tool, while BSA estimates body surface area. The two measurements are not interchangeable.
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