Body Surface Area (BSA) Calculator
Calculate your Body Surface Area using Mosteller and Du Bois formulas. Enter your weight and height to estimate your BSA.
Your Body Surface Area (BSA) Results
| Formula | BSA (m²) | BSA (ft²) | BSA (in²) |
|---|---|---|---|
| Mosteller | |||
| Du Bois | |||
| Haycock | |||
| Gehan and George | |||
| Boyd | |||
| Fujimoto | |||
| Takahira |
Body Surface Area (BSA) Calculator – Accurate & Easy Online Tool
Our free Body Surface Area (BSA) Calculator helps you estimate your body surface area using scientifically proven formulas. BSA is commonly used in medical settings to calculate drug dosages, determine metabolic rates, and assess health risks. Whether you're a healthcare professional, fitness enthusiast, or simply curious, this tool is designed to be user-friendly, accurate, and comprehensive.
🔍 What is Body Surface Area?
Body Surface Area is the total external surface area of your body, measured in square meters (m²). It plays a crucial role in medical dosing (especially chemotherapy), kidney function evaluation, and calculating the basal metabolic rate (BMR). BSA is considered a more precise measure than just using body weight or BMI in certain clinical settings.
📏 How is BSA Calculated?
BSA is calculated using your height and weight. Depending on your needs, several mathematical formulas are used. Our calculator provides results in:
- ✅ Square meters (m²)
- ✅ Square feet (ft²)
- ✅ Square inches (in²)
🧮 Supported BSA Formulas
We include results from all major BSA formulas so you can compare and choose what suits your purpose:
BSA = √((height × weight) / 3600)
Most commonly used in hospitals. Easy and fast.
BSA = 0.007184 × weight^0.425 × height^0.725
One of the earliest and widely accepted formulas in clinical medicine.
BSA = 0.024265 × weight^0.5378 × height^0.3964
Ideal for children and infants.
BSA = 0.0235 × weight^0.51456 × height^0.42246
BSA = 0.0003207 × height^0.3 × (1000 × weight)^(0.7285 − 0.0188 × log₁₀(1000 × weight))
Complex but highly accurate for pediatric patients.
BSA = 0.008883 × weight^0.444 × height^0.663
Frequently used in Japanese populations.
BSA = 0.007241 × weight^0.425 × height^0.725
🎯 Why Use Our Online BSA Calculator?
- 🟢 Get BSA in m², ft², and in²
- 🟢 Supports both Metric (kg/cm) and US (lbs/ft/in) units
- 🟢 All 7 medical formulas in one calculator
- 🟢 Mobile friendly, responsive, and fast
- 🟢 Free to use – no login or sign-up needed
📘 Frequently Asked Questions (FAQs)
- Is BSA better than BMI? – BSA provides more clinical accuracy in dosage calculations and is used in many medical protocols.
- Can I use this BSA calculator for children? – Yes, formulas like Haycock and Boyd are especially accurate for pediatric use.
- How accurate are these BSA formulas? – While formulas vary slightly, they all provide close estimates used in healthcare.
Use this Body Surface Area Calculator regularly to monitor your health or assist in medical decisions. It's fast, accurate, and suitable for anyone.