Body Surface Area Calculator
Units:
Body Surface Area (BSA) is the measured or calculated surface area of a human body. It is used in clinical medicine to calculate drug doses (particularly chemotherapy), burn area assessment, and metabolic rate estimation. BSA is considered more accurate than body weight alone for drug dosing.
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Tip: For chemotherapy dosing, BSA-based calculations reduce the risk of under-dosing (ineffective treatment) and over-dosing (toxicity) compared to weight-based or fixed dosing.
- 1Mosteller formula: BSA = √(H × W / 3600) — simple and widely used
- 2DuBois formula: BSA = 0.007184 × H^0.725 × W^0.425 — original 1916 formula
- 3Haycock formula: BSA = 0.024265 × H^0.3964 × W^0.5378 — most accurate for children
- 4H = height in cm, W = weight in kg, result in m²
Adult male: 80 kg, 180 cm=BSA ≈ 2.0 m²Average adult male BSA is 1.9 m²
Child: 20 kg, 110 cm=BSA ≈ 0.76 m²BSA scales non-linearly with size
| Population | Average BSA |
|---|---|
| Adult male | 1.9 m² |
| Adult female | 1.7 m² |
| Child (age 10) | 1.14 m² |
| Child (age 5) | 0.76 m² |
| Newborn | 0.25 m² |
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Fun Fact
The original DuBois BSA formula was derived in 1916 from just 9 subjects. Despite this small sample, it has remained the clinical standard for over 100 years due to its reasonable accuracy across body sizes.
References
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