Body Surface Area (BSA) Calculator
Estimate your body surface area in square meters using Mosteller and Du Bois formulas.
Enter Your Details
Units
Results
Mosteller
—
sqrt( (height(cm) × weight(kg)) ÷ 3600 )
Du Bois
—
0.007184 × weight(kg)^0.425 × height(cm)^0.725
Context
Enter your height and weight to see BSA in m².
Body Surface Area Guide
Understanding BSA
Body Surface Area estimates the total external surface of your body. It’s widely used to determine medical dosages (like chemotherapy), assess metabolic needs, and normalize physiologic measurements.
- Units: Square meters (m²).
- Inputs: Height and weight; formula choice may change slightly.
- Typical adult range: ~1.5–2.2 m² depending on body size.
Common Formulas
- Mosteller: Simple and widely used in clinical practice.
- Du Bois: Historical reference; produces similar values.
- Others: Haycock, Boyd, and Gehan–George variants exist.
Limitations
- Population basis: Formulas were derived from specific cohorts.
- Extremes of size: Accuracy may be lower at very low/high weights.
- Not a body comp metric: BSA doesn’t indicate fat or muscle mass.
Action Steps
- Measure carefully: Use recent, accurate height and weight.
- Consult clinicians: For dosing decisions, follow clinical guidance.
- Use consistently: Stick to one formula for trend comparisons.
Important: This tool is educational and not a substitute for professional medical advice. Always follow your healthcare provider’s instructions for medication dosing.