BSA calculator

Free Online Body Surface Area (BSA) Calculator — Calculate BSA Instantly

Quickly and accurately calculate your body surface area (BSA) using our free Online BSA Calculator. This tool provides results using multiple widely accepted formulas including Mosteller, Du Bois & Du Bois, Haycock, Gehan & George, and Boyd. It’s perfect for healthcare, nutrition, and clinical calculations.

How to Use the BSA Calculator

Follow these simple steps to calculate your BSA:

1. Enter your weight in kilograms (kg) and height in centimeters (cm).
2. Select the formula you want to use (Mosteller, Du Bois, Haycock, Gehan & George, or Boyd).
3. Click Calculate to see your BSA instantly.
4. Press Clear to reset all fields.

Supported Formulas

• Mosteller: BSA = √(Height × Weight / 3600)
• Du Bois & Du Bois: BSA = 0.007184 × Weight^0.425 × Height^0.725
• Haycock: BSA = 0.024265 × Weight^0.5378 × Height^0.3964
• Gehan & George: BSA = 0.0235 × Weight^0.51456 × Height^0.42246
• Boyd: BSA = 0.0003207 × Height^0.3 × Weight^(0.7285 – 0.0188 log10(Weight))

Why Use This BSA Calculator?

• ⚡ Instant and precise calculations using multiple recognized formulas.
• 💻 Works directly in your browser — no downloads or registration needed.
• 📱 Fully responsive and mobile-friendly for use on any device.
• 🏫 Ideal for healthcare professionals, students, researchers, and fitness enthusiasts.

Examples

Example 1: Weight = 70 kg, Height = 175 cm → Mosteller BSA = 1.84 m²
Example 2: Weight = 60 kg, Height = 160 cm → Du Bois BSA = 1.63 m²

Sources for Formulas

• Mosteller, 1987
• Du Bois & Du Bois, 1916
• Haycock, 1978
• Gehan & George, 1970
• Boyd, 1935