Estimate Body Surface Area (BSA) using multiple published formulas. Results are educational and must not be used alone for medication dosing or clinical decisions.
| Formula | BSA (m²) | Difference | Best For |
|---|---|---|---|
| Du Bois | 1.810 | — | General use |
| Mosteller | 1.818 | +0.5% | Quick calculation |
| Boyd | 0.029 | -98.4% | Research |
| Haycock | 1.826 | +0.9% | Pediatrics |
Chemotherapy and medication dosing
Heart function assessment
Burn severity calculation
Compare Body Surface Area (BSA) estimates from several published formulas. Clinical use, including medication dosing, requires professional verification and appropriate patient context.
Du Bois, Mosteller, Boyd, and Haycock formulas
Support for both metric and imperial measurements
Quick presets for different patient categories
Automatic BMI calculation and categorization
Du Bois formula is most commonly used in clinical practice
Most widely used in clinical practice
Simplified calculation, easier to remember
More complex but potentially more accurate
Commonly used in pediatric medicine
BSA is the measured or calculated surface area of a human body. It's used in medical calculations for drug dosages, cardiac output, and various physiological assessments.
Du Bois formula is most commonly used in clinical practice. Mosteller is simpler to calculate. Haycock is preferred for pediatric patients.
BSA is crucial for accurate drug dosing (especially chemotherapy), calculating cardiac index, assessing burn severity, and normalizing physiological measurements.
These formulas are validated and widely used in medical practice. Differences between formulas are typically small (±5%) for normal body habitus.
Average adult BSA ranges from 1.5-2.0 m². Children have smaller BSA values, while larger adults may exceed 2.0 m².
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Transparency & trust
The page implements published Mosteller, Du Bois, Boyd, and Haycock body-surface-area equations.
Reviewed by Jack Tao
Technical methodology reviewer
Full-stack developer with 10+ years of software engineering experience
This review checks implementation, formulas, units, edge cases, and alignment with the cited material. It does not represent independent medical or financial advice.
Important limitation
For educational information only. This estimate is not medical advice, a diagnosis, or a substitute for care from a qualified health professional.
Do not use this website alone to determine medication dosing or treatment. Formula choice and dosing must be confirmed by a qualified clinician or pharmacist.