Body Surface Area Calculator
Body surface area from height and weight. Primary formula is Mosteller: sqrt(cm * kg / 3600). Du Bois and Haycock are listed as well. Informational, not medical advice and not a dosing chart.
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How to calculate BSA
- Choose metric (cm, kg) or US (feet, inches, pounds).
- Enter height and weight. US inputs convert with 1 lb = 0.45359237 kg and 1 in = 0.0254 m.
- Read Mosteller m2, plus Du Bois and Haycock for comparison.
- Note: informational, not medical advice. Nothing is uploaded.
Body surface area
Mosteller sqrt(cm * kg / 3600)
| Mosteller | sqrt(height_cm * weight_kg / 3600) in m2 |
|---|---|
| Du Bois | 0.007184 * cm^0.725 * kg^0.425 |
| Haycock | 0.024265 * kg^0.5378 * cm^0.3964 |
| US units | Same lb and inch factors as the BMI page |
| Default | 170 cm and 70 kg |
| Advice | Informational. Not medical advice or a dose. |
What Mosteller BSA is
Mosteller BSA is the square root of (height in cm times weight in kg divided by 3600), in square meters. The default 170 cm and 70 kg is about 1.82 m2. The page also prints Du Bois and Haycock, which can differ by a few percent.
Height, weight, and the three formulas
Height and weight use the same metric or US controls as BMI. Mosteller is common in teaching. Du Bois is an older adult formula. Haycock is often used in pediatrics in clinics. This page still does not apply pediatric dosing rules.
How US units convert
Pounds convert with 1 lb = 0.45359237 kg. Inches convert with 1 in = 0.0254 m, then to cm. Inches of 12 or more add into total height, same as the BMI page.
Note
Informational, not medical advice. Do not use this page to dose chemotherapy or any drug. Formulas disagree, and clinics pick one on purpose. See the disclaimer. CZNull does not receive height or weight.