Estimate your body surface area in square metres from your height and weight, using the Mosteller and Du Bois formulas.
Understanding the body surface area calculation
Body surface area is used in medicine for dosing and physiological calculations. Enter your height and weight and this calculator returns BSA using two standard formulas.
It’s provided for general information; clinical decisions should be made by professionals.
Step by step
- Enter your height in centimetres.
- Enter your weight in kilograms.
- Read the BSA from each formula.
The formula
Mosteller BSA = √(height × weight ÷ 3600)
The default scenario, worked through
On the values this calculator opens with, the body surface area is 1.84. Alongside it, Du Bois comes out at 1.85 m². Change any field and every figure updates as you type.
Frequently asked questions
What is body surface area used for?
In medicine it helps with drug dosing (especially chemotherapy) and normalising physiological measurements.
Which formula should I use?
Mosteller is simple and widely used; Du Bois is the older standard. They give similar results for most people.
Is this a medical tool?
No — it’s for general information. Clinical dosing must be done by qualified healthcare professionals.