Body Surface Area Calculator
Health
Estimate surface area using the Mosteller equation.
Formula
BSA = √[height (cm) × weight (kg) / 3600]
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations retain full precision.
- Educational estimate. Do not use this tool to determine medication doses.
Example Calculation
Example inputs
- Height: 175 cm
- Weight: 70 kg
175 cm and 70 kg gives approximately 1.84 m².
Frequently asked questions
How do I use this calculator?
Enter height, weight. The result updates automatically. Use Reset to restore the example values.
What method does it use?
BSA = √[height (cm) × weight (kg) / 3600]. Educational estimate. Do not use this tool to determine medication doses.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.