CalcVind

Body Surface Area Calculator

BSA in m² by Mosteller, Du Bois and more

Height and Weight

For information only. Medicine doses must be set by a doctor or pharmacist.

Body Surface Area

1.818 m²Mosteller (most used)
1.824 m²Average of 5 formulas
1.81 m²
Du Bois
1.826 m²
Haycock
1.831 m²
Gehan–George
1.835 m²
Boyd
  1. 1
    Enter weight
    In kg or lb
  2. 2
    Enter height
    In cm, ft + in, m or inches
  3. 3
    See the BSA
    Five formulas compared

BSA formulas

Body surface area is estimated from weight (W, kg) and height (H, cm). Mosteller's is the simplest and most widely used:

Mosteller: √(H × W ÷ 3600)

Du Bois: 0.007184 × W^0.425 × H^0.725

Haycock: 0.024265 × W^0.5378 × H^0.3964

What BSA is used for

Doctors use BSA to scale chemotherapy and some other drug doses, to index heart output (cardiac index), and to adjust kidney function results. It reflects metabolic size better than weight alone.

Typical values

An average adult has a BSA of about 1.7 m²: around 1.9 m² for men and 1.6 m² for women. A newborn is about 0.25 m².

Related calculators

Frequently asked questions

What is a normal body surface area?

Around 1.6 m² for adult women and 1.9 m² for adult men.

Which BSA formula should I use?

Mosteller is the standard in most hospitals because it's simple and accurate. Haycock is often preferred for children.

Can I use this to calculate a medicine dose?

No. Dosing depends on many factors and must be done by your doctor or pharmacist.

Sources

Last reviewed: October 2026