BSA Calculator

Calculate body surface area from height and weight with the Mosteller, DuBois, Haycock and Gehan-George formulas. Example: 170 cm and 70 kg gives a Mosteller BSA of 1.82 square meters.

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Height

Height unit

Weight

Weight unit

How to use the BSA Calculator

Enter your height and weight and choose the units.
Press Calculate to see body surface area by four formulas.

Formula and method

Mosteller: BSA (m2) = sqrt(height cm x weight kg / 3600). DuBois: 0.007184 x weight^0.425 x height^0.725. Haycock: 0.024265 x weight^0.5378 x height^0.3964. Gehan-George: 0.0235 x weight^0.51456 x height^0.42246.

Worked example: 170 cm, 70 kg

Formula	BSA
Mosteller	1.818
DuBois	1.810
Haycock	1.826

Typical BSA values

Group	BSA (m2)
Newborn	0.25
Child (age 9)	1.07
Adult woman	1.6
Adult man	1.9

Where BSA is used

Clinicians use BSA to scale chemotherapy and other drug doses, to index cardiac output and kidney function, and to estimate burn area. It is not a measure of body fat.

Frequently asked questions

What is body surface area?

The total surface area of the body, in square meters.

How is BSA calculated?

With a formula from height and weight, such as Mosteller.

What is a normal BSA?

About 1.6 for adult women and 1.9 for adult men.

Which BSA formula is best?

Mosteller is the most common because it is simple and accurate.

Is BSA used for drug dosing?

Yes, for some drugs such as chemotherapy, as decided by clinicians.

Does BSA measure fat?

No, only size.

Sources

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