About this Body Surface Area
Body Surface Area (BSA) is considered a more accurate metric than weight alone for determining metabolic mass, which is why it is used for calculating chemotherapy dosages and cardiac index.
Who this calculator is for
- Clinicians and trainees who need a quick BSA estimate for indexed calculations.
- People reviewing dosing discussions that mention Mosteller or Du Bois formulas.
- Anyone who needs BSA as an input for another tool such as cardiac index.
When to use it
- Use this calculator when a protocol or article references BSA rather than weight alone.
- Use it to compare the two common bedside formulas before documenting an estimate.
- Use it as a helper when you plan to calculate indexed hemodynamic values next.
How to use this calculator
- Enter Height (cm).
- Enter Weight (kg).
- Compare results from Du Bois and Mosteller formulas.
Key assumptions
- Both formulas estimate body surface area from height and weight rather than measuring it directly.
- The result is suitable for education and quick reference, but medication dosing should follow the specific protocol in use.
- BSA is a body-size estimate and does not account for edema, amputations, or unusual body composition.
Accuracy and testing
Review formula sources, default test cases, assumptions, unit handling, rounding rules, and changelog for this calculator.
Key Features
- Instant Calculation
- Private & Secure
- Mobile Optimized
Things to Keep in Mind
BSA formulas are estimates derived from population averages. Clinical dosing should always follow strict protocols.