Online Tool Store
Body Surface Area Calculator
Calculate body surface area (BSA) from height and weight using the Du Bois, Mosteller, or Haycock formula. Runs entirely in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
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square meters (m²)
Used in medicine to dose chemotherapy and other drugs — not a general fitness or health metric.
How it works
- Enter height in centimeters and weight in kilograms.
- Choose a formula — Du Bois, Mosteller, or Haycock.
- Read the result in square meters (m²).
The formulas
Du Bois: BSA = 0.007184 × height^0.725 × weight^0.425
Mosteller: BSA = √(height × weight ÷ 3600)
Haycock: BSA = 0.024265 × height^0.3964 × weight^0.5378
(height in cm, weight in kg, BSA in m²)
FAQ
What is body surface area used for?
It's a standard measurement in clinical medicine, most commonly for dosing chemotherapy drugs and some other medications where dose scales more accurately with body surface area than with weight alone.
Which formula should I use?
Du Bois is the oldest and most widely cited; Mosteller is simpler and commonly used in clinical settings today; Haycock is often preferred for children. All three give similar results for typical adult body sizes.
Is this a substitute for medical advice?
No — this is an educational reference. Drug dosing decisions should always be made by a qualified healthcare provider using validated clinical tools.
Is my data uploaded anywhere?
No — every calculation happens locally in your browser. Nothing is sent to a server.
How we compare
| Feature | Online Tool Store | Manual formula lookup | Clinical dosing software |
|---|---|---|---|
| Three formulas side by side | ✓ | One at a time, by hand | Usually one built-in formula |
| No install, instant | ✓ | ✓ | Part of a larger clinical system |
For students, educators, or a quick reference calculation, this is faster than doing the exponentiation by hand.