🏃 Health & Fitness
Body Surface Area Calculator
Body surface area is used for dosing, burns assessment and cardiac index. Du Bois and Mosteller were both derived from the same kind of height-and-weight data and usually agree within a few per cent; Haycock tends to run slightly higher. Showing all three is more honest than picking one silently.
How the three formulas compare
How it works
Height
Weight
Formula used for the headline figure
Body surface area
Mosteller formula
Du Bois formula
Haycock formula
Body mass index
Frequently asked questions
How do I use the Body Surface Area Calculator?
Fill in the fields above — the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.