BSA Calculator

Estimate body surface area from height and weight using the Mosteller formula.

Key formula

Mosteller formula

About this tool

Body surface area is used in several clinical and physiological contexts because body size is not always captured well by weight alone. This page helps users see how height and weight combine into a size-normalized estimate.

How to use this calculator

1. Enter realistic personal values and double-check the chosen unit system before calculating.
2. Use the result as a planning estimate, not as a diagnosis or guaranteed outcome.
3. Compare the output with your goal, context, and any relevant professional guidance.
4. Review the steps to understand how the estimate was produced from your inputs.