Estimate BSA from height and weight using the Mosteller formula, with optional Du Bois and Haycock comparisons. Results are estimates, not medical decisions.
01 / HEIGHT & WEIGHT
Enter measured height and weight. Mosteller is selected by default; no age or sex input is required by these equations.
02 / ESTIMATE
Enter height and weight, then calculate an estimate in square meters.
03 / FORMULAS & LIMITATIONS
All three formulas use height in centimeters and weight in kilograms, returning square meters. They were developed from different empirical relationships and study populations. Body shape, composition, measurement technique and extreme sizes can affect individual accuracy; none is universally accurate.
Haycock coefficients were checked against the 1978 paper abstract; Du Bois coefficients against published formula references. The Mosteller implementation uses the mathematically equivalent √height × √weight ÷ 60 to avoid intermediate product underflow, not a rounded 0.016667 coefficient.
This calculator is an educational estimate only. It provides no medication dosing, treatment recommendations or medical decision support. Positive inputs within software limits do not establish clinical validity.
Software bounds: positive height up to 300 cm and positive weight up to 1,000 kg (or unit equivalents). These are not clinical reference ranges. Inputs outside reliable numerical representation are rejected.
Measurements are processed locally in your browser without uploads or storage.
Enter your values locally; no inputs are uploaded.
Check validation feedback before reviewing the browser-generated result.
Review the explanation, copy supported outputs or reset the workspace.
Enter measured height and weight with their units, then Calculate BSA. Advanced options select Du Bois or Haycock and compare formulas. Copy the estimate or Reset.
Published formulas, exact unit conversion factors, clear assumptions and optional side-by-side formula values in a stacked result panel.
Your measurements are calculated locally in your browser without uploads or storage.
Mosteller (1987): BSA in m² = square root of height in cm × weight in kg ÷ 3600. The calculation uses the exact divisor 3600 rather than a rounded equivalent coefficient.
Du Bois and Du Bois (1916): 0.007184 × height(cm)^0.725 × weight(kg)^0.425. Haycock, Schwartz and Wisotsky (1978): 0.024265 × height(cm)^0.3964 × weight(kg)^0.5378. All results are in square meters.
Yes. Height may be entered in centimeters or total inches; weight in kilograms or pounds. One inch is exactly 2.54 cm and one pound is exactly 0.45359237 kg. Original measurements are retained when display units change.
These equations approximate surface area from height and weight using different empirical relationships and study populations. Body shape, composition, measurement technique and extreme sizes affect their applicability. No formula is universally accurate for every individual.
Yes. Enable comparison in Advanced to see Mosteller, Du Bois and Haycock estimates for the same measurements. Differences do not establish which formula is correct for an individual. Display rounding does not alter the underlying calculations.
No. This calculator supplies a BSA estimate only. It provides no medication dosing, treatment recommendation or medical decision support. Positive inputs within the software bounds do not establish clinical validity.