Body Surface Area (BSA) Calculator
Calculate Body Surface Area using the Mosteller formula.
Supports metric and imperial units.
Used for medication dosing and clinical assessments.
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Body Surface Area
Body Surface Area (BSA) estimates the total surface area of the human body. It is widely used in medicine, especially for chemotherapy dosing and burn assessments.
Mosteller Formula (most commonly used):
Metric:
BSA (m²) = √((Height (cm) × Weight (kg)) / 3600)
Imperial:
BSA (m²) = √((Height (in) × Weight (lbs)) / 3131)
Other BSA formulas:
- Du Bois:
0.007184 × Height(cm)^0.725 × Weight(kg)^0.425 - Haycock:
0.024265 × Height(cm)^0.3964 × Weight(kg)^0.5378
Average BSA values:
- Adult male: ~1.9 m²
- Adult female: ~1.6 m²
- Newborn: ~0.25 m²
- Child (10 years): ~1.14 m²
Clinical uses of BSA:
- Chemotherapy dosing: Many cancer drugs are dosed per m²
- Burn assessment: Percentage of BSA affected
- Cardiac index: Cardiac output divided by BSA
- Renal function: GFR adjusted for BSA
- Drug clearance calculations
Unit conversions:
- 1 kg = 2.205 lbs | 1 lb = 0.4536 kg
- 1 cm = 0.3937 in | 1 in = 2.54 cm