Body Surface Area (BSA)
Compute body surface area from height and weight using both the Du Bois (1916) and Mosteller (1987) formulas, side by side.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Weight
- 70 kg
- Height
- 175 cm
Result: Du Bois ~1.85 m^2; Mosteller ~1.84 m^2
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Weight
- Height
What this is
Sophie Well accepts metric or US units, returns BSA in m^2 rounded to two decimals, and shows both formulas so you can match whichever the order set or institutional protocol cites.
When to use it
Use this whenever a dose is BSA-indexed - chemotherapy regimens, pediatric drug dosing, cardiac index calculations - or when a fluid or steroid plan calls for mg/m^2. Mosteller is the typical bedside default because the math is simpler; Du Bois is the historical reference standard. Both diverge from measured BSA at the extremes of body habitus.
How this is calculated
Du Bois D, Du Bois EF. Arch Intern Med. 1916;17:863 (reprinted in Nutrition. 1989;5(5):303-311). Mosteller RD. N Engl J Med. 1987;317(17):1098. Read the sources: Du Bois 1916 (reprint) ↗, Mosteller 1987 ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.