Body Surface Area Calculator
Calculate body surface area from height, weight, and age
Enter age directly
Enter height, weight, and age to calculate body surface area. For ages under 15, the Haycock formula is used. For ages 15 and older, the DuBois and Mosteller formulas are displayed.
About this tool
The BSA Calculator estimates Body Surface Area from height and weight using well-known formulas. It is provided as an educational reference; clinical decisions must always involve a qualified professional.
Common use cases
- Study how BSA varies across common patient or athlete profiles.
- Look up a quick reference value when studying physiology or pharmacology.
- Compare results between formulas such as Du Bois and Mosteller for academic work.
- Use as a teaching aid in classes that introduce BSA-based dosing.