About this calculator
Enter height and weight. Mosteller is the most widely used formula; Du Bois and Haycock are shown for comparison.
How to use it
- Enter height.
- Enter weight.
- Read the BSA.
The formula
Mosteller BSA = √(height in cm × weight in kg ÷ 3600)
- Du Bois
- 0.007184 × weight^0.425 × height^0.725
- Haycock
- 0.024265 × weight^0.5378 × height^0.3964
Worked example
170 cm, 68 kg
- Mosteller = √(170 × 68 ÷ 3600) = 1.79 m².
- Du Bois and Haycock both give about 1.79 to 1.80 m².
What the result means
An average adult BSA is about 1.7 m² for women and 1.9 m² for men.
Assumptions
- Height and weight measured accurately.
Limitations
- For information only. Medicine doses must be set by a doctor.
Frequently asked questions
What is a normal BSA?
About 1.6 to 1.9 m² for most adults.
Which formula do hospitals use?
Mosteller is the most common; some use Du Bois.
Can I use this to dose medicine?
No. Dosing must always be decided by a doctor or pharmacist.
Not medical advice. This calculator is a general screening tool and cannot diagnose any condition. Results are estimates. Please talk to a doctor or a qualified health professional about your health and before making changes to diet, exercise or treatment.
Last reviewed on 1 October 2026. Found a mistake? Tell us.