Body Surface Area Calculator
Calculate body surface area (BSA) in square meters using both the Mosteller and Du Bois formulas.
Mosteller formula
1.84 m²
Du Bois formula1.85 m²
Body surface area (BSA) is used in medicine to calculate drug dosages and clinical indices based on body size. Enter your height and weight to see BSA calculated with both the Mosteller and Du Bois formulas, instantly in your browser.
How to use
- Enter your height in centimeters and weight in kilograms.
- Read your body surface area calculated with the Mosteller formula.
- Compare against the Du Bois formula result shown alongside it.
Frequently asked questions
- Why are there two different formulas?
- Mosteller and Du Bois are both widely used BSA formulas; they usually agree closely but can differ slightly at extreme heights or weights.
- What is BSA used for?
- Clinicians use body surface area to calculate medication dosages, especially for chemotherapy, and certain cardiac and kidney function indices.
- Which formula should I trust more?
- Mosteller is simpler and commonly used in clinical practice; Du Bois is an older, well-validated alternative. Both are estimates, not replacements for medical advice.