BSA Calculator
Calculate your Body Surface Area using multiple validated medical formulas
Calculate Your BSA
Most commonly used formula, developed in 1916. Widely accepted for medical calculations.
Height in centimeters
Weight in kilograms
BSA Results
⚠️ Medical Disclaimer
This BSA calculator is for educational and informational purposes only. Body Surface Area calculations are used in medical settings for drug dosing, cardiac output assessments, and other clinical applications. Always consult healthcare professionals for medical decisions and proper interpretation of BSA values in clinical contexts.
Example Calculations
Adult Male Example (Du Bois Formula)
Height: 180 cm (5 feet 11 inches)
Weight: 75 kg (165 lbs)
BSA Calculation: 0.007184 × 75^0.425 × 180^0.725 = 1.94 m²
Category: Large Adult (typical for adult men)
Adult Female Example (Mosteller Formula)
Height: 165 cm (5 feet 5 inches)
Weight: 60 kg (132 lbs)
BSA Calculation: √(165 × 60 / 3600) = √2.75 = 1.66 m²
Category: Average Adult (typical for adult women)
Child Example (10 years old)
Height: 140 cm (4 feet 7 inches)
Weight: 32 kg (70 lbs)
BSA Calculation: √(140 × 32 / 3600) = √1.24 = 1.11 m²
Category: Child (typical for 10-year-old)
Average BSA Values
Formula Selection Guide
Du Bois
Most widely used, general medical calculations
Mosteller
Simple calculation, medication dosing
Haycock
Pediatric patients, all age groups
Gehan & George
Oncology, chemotherapy dosing
Fujimoto
Recent formula, good accuracy
Clinical Applications
Drug dosing calculations
Chemotherapy dose determination
Cardiac output assessments
Metabolic rate estimation
Research and clinical studies
Understanding Body Surface Area (BSA)
What is Body Surface Area?
Body Surface Area (BSA) is the external surface area of the human body measured in square meters (m²). It's calculated using height and weight measurements and provides a more accurate assessment of metabolic rate than body weight alone.
Medical Applications
- •Drug dosing calculations (especially chemotherapy)
- •Cardiac output and stroke volume calculations
- •Metabolic rate and caloric needs assessment
- •Burn assessment and fluid resuscitation
- •Hemodialysis and organ function studies
Why Use BSA Instead of Weight?
BSA provides a better correlation with physiological processes than body weight alone. Many metabolic processes are more closely related to body surface area than to total body mass.
- ✓Better predictor of metabolic rate
- ✓More accurate for drug dosing
- ✓Accounts for both height and weight
- ✓Universal measurement across age groups
Important: BSA calculations are used for critical medical dosing decisions. Always verify calculations and consult healthcare professionals for medical applications.
BSA Formula Comparison
| Formula | Equation | Best For | Year |
|---|---|---|---|
| Du Bois | 0.007184 × W^0.425 × H^0.725 | General medical use | 1916 |
| Mosteller | √(H × W / 3600) | Easy calculation | 1987 |
| Haycock | 0.024265 × W^0.5378 × H^0.3964 | Pediatric patients | 1978 |
| Gehan & George | 0.0235 × W^0.51456 × H^0.42246 | Oncology dosing | 1970 |
| Fujimoto | 0.008883 × W^0.444 × H^0.663 | High accuracy | 1968 |
W = Weight (kg), H = Height (cm)