Body Surface Area Calculator
Free BSA calculator to compute body surface area in m² using Mosteller, Du Bois, Haycock, and Gehan-George medical formulas.
Mosteller (1987)
Simplified formula, widely accepted
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Calculate Your Body Surface Area (BSA)
Body Surface Area is used in medicine to calculate drug dosages, determine burn severity, and assess body size. Our calculator supports multiple formulas including Mosteller (most common), Du Bois, Haycock, and more.
Understanding Body Surface Area
BSA measures total skin surface area in square meters. Unlike BMI, BSA accounts for both height and weight to estimate actual body size. Average adult BSA is 1.7-2.0 m². BSA is preferred over weight for dosing many medications because it better correlates with metabolic rate.
Mosteller Formula (Most Common)
BSA = √((Height × Weight) / 3600)How to Use the Calculator
Common Use Cases
Medical Dosing
Calculate appropriate medication doses.
Burn Assessment
Determine percentage of body affected.
Health Metrics
Complement BMI with BSA measurement.
Frequently Asked Questions
Mosteller is most widely used due to simplicity. Du Bois is the classic formula. Haycock is preferred for children. Your healthcare provider may specify which to use.