Estimate body surface area using common formulas like Mosteller, Du Bois, Haycock, Gehan and George, and Boyd. This free BSA calculator supports US and metric units and shows multiple body surface area estimates in one place.
Mosteller formula:
BSA = √((height in cm × weight in kg) ÷ 3600)
Du Bois formula:
Uses exponents on height and weight to estimate body surface area.
Haycock, Gehan and George, and Boyd:
These formulas also use body weight and height with slightly different assumptions.
Average estimate:
This calculator also shows the average of the formulas for a simple midpoint reference.
Body surface area is used in a variety of health and clinical settings, including medication dosing, medical assessments, and body-size comparisons.
It can sometimes give a more useful body-size reference than weight alone.
Your result shows body surface area estimates from several common formulas. It also gives an average BSA estimate so you can compare methods more easily.
This gives a broader reference instead of relying on only one formula.
Body surface area is an estimate of the total external surface of the human body, usually expressed in square meters.
Different formulas were developed using different datasets and methods, so they can produce slightly different estimates.
Mosteller is one of the most widely used formulas because it is simple and practical.
No. BMI estimates weight relative to height, while BSA estimates external body surface area.