BSA Calculator
Mosteller √(cm × kg / 3600) in m². Click any i for detail.
Body size
Units
i
Units
US customary or metric. |
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Height (ft)
i
Feet
Whole feet. |
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Height (in)
i
Inches
Extra inches. |
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Weight (lb)
i
Pounds
Body weight. |
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Height (cm)
i
cm
Height in centimeters. |
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Weight (kg)
i
kg
Weight in kilograms. |
How to use this calculator
- Pick US (ft/in, lb) or metric (cm, kg).
- Enter height and weight.
- Read Mosteller m² in the headline.
- Compare Du Bois in the breakdown if shown.
Results explained
Body surface area estimates skin area for some dosing teaching problems. Protocols specify which formula to use; this is not a chemotherapy order.
Quick reference: BSA formulas
Mosteller is common in education; Du Bois is older.
| Item | Detail |
|---|---|
| Mosteller | √(cm × kg / 3600) m² |
| Du Bois | 0.007184 × kg^0.425 × cm^0.725 |
| Typical adult | often ~1.6–2.0 m² |
| Obesity | height-weight formulas break down |
Amputations and edema need clinical methods not modeled here.
How the estimate is built
BSA_Mosteller = √(height_cm × weight_kg / 3600).
Example scenario
170 cm, 70 kg → about 1.82 m².
FAQ
Which formula should I use?
Follow the protocol you were taught or ordered. We show two common estimates.
Is BSA the same as lean mass?
No. Lean body mass pages estimate fat-free mass differently.
Can I enter pounds only?
Use ft/in + lb mode so height and weight convert internally.