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Body Surface Area Calculator

Body surface area (BSA) by the Du Bois, Mosteller, Haycock and Gehan-George formulas — used for drug dosing.

Enter values

Results update as you type.

Result

BSA (Mosteller)

1.818 m²

Du Bois
1.81 m²
Haycock
1.826 m²
Gehan-George
1.831 m²

Educational estimate only — not medical advice. Talk to a healthcare professional about your individual situation.

About the Body Surface Area Calculator

Body surface area (BSA) by the Du Bois, Mosteller, Haycock and Gehan-George formulas — used for drug dosing.

Also known as: bsa calculator, mosteller formula, du bois formula, body surface.

How to use this calculator

  1. Enter units and the other fields.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

Mosteller: √(height cm × weight kg ÷ 3600)

Worked example

Using the values pre-filled in the calculator above:

  • Units: Metric (kg, cm)
  • Weight = 70 kg
  • Height = 170 cm

the calculator returns:

  • BSA (Mosteller): 1.818 m²
  • Du Bois: 1.81 m²
  • Haycock: 1.826 m²
  • Gehan-George: 1.831 m²