Body Surface Area Calculator
Calculate body surface area (BSA) using the Mosteller and DuBois formulas. Used in medical dosing, chemotherapy, and burn assessment.
Part of our Health Calculators collection.
Body Surface Area Calculator
Free online calculator
Results update automatically as you type
How to Use This Calculator
- 1
Enter weight in kg.
- 2
Enter height in cm.
- 3
See BSA in m² from both formulas.
BSA Formulas
Mosteller (most widely used in clinical practice): BSA = √(Height(cm) × Weight(kg) / 3,600) DuBois & DuBois: BSA = 0.007184 × Height(cm)^0.725 × Weight(kg)^0.425 Average adult BSA: ~1.7–1.9 m²
Example Calculation
Example: 70 kg, 175 cm
Inputs
weightKg: 70heightCm: 175
Result
1.847 m² (Mosteller)
√(175 × 70 / 3600) = √3.403 = 1.845 m².
Frequently Asked Questions
When is BSA used in medicine?
BSA is used for chemotherapy dosing, cardiac output calculations, kidney function assessment (GFR), and pediatric medication dosing. It's considered more accurate than body weight for many drug dose calculations.
Which formula is most accurate?
The Mosteller formula is most commonly used in clinical practice due to its simplicity. DuBois is the historical standard but both are within 5% for most patients.