Body Surface Area Calculator
Estimates the surface area of your body in square metres.
Share sends a link that reopens these numbers. Copy details pastes the full breakdown as a list.
The formula
Mosteller: √(height in cm × weight in kg ÷ 3,600) Du Bois: 0.007184 × weight^0.425 × height^0.725
Both take weight in kg and height in cm.
What to watch out for
Du Bois and Du Bois published their formula in 1916 from just nine people. Mosteller’s 1987 version is a simpler one that gives close results for most adults. Both can drift at the extremes of body size, and they do not agree exactly with one another.
Frequently Asked Questions
What is the BSA of someone 170 cm and 70 kg?
1.82 m² on Mosteller and 1.81 m² on Du Bois.
What is BSA used for?
Mostly in medicine, for scaling some drug doses and comparing kidney or heart measurements between people of different sizes.
What does 1.73 m² mean on a kidney test?
It is the conventional reference size for reporting kidney function, not a target for you.