Body Fat %
Estimate body-fat percentage from BMI, age and sex.
Enter values
kg
cm
years
—
—
Step by step
The formula
BF% = 1.20·BMI + 0.23·age − 10.8·sex − 5.4
The Deurenberg formula estimates body fat from BMI, age and sex, since fat mass tends to rise with age at the same BMI. It is a rough approximation from easily measured inputs — calipers, DEXA scans or hydrostatic weighing are far more accurate if you need real precision.
All calculations run locally in your browser and update instantly as you type.
Example calculations
Common questions this calculator answers — select one to load its values.
Related calculators
Frequently asked questions
How accurate is this estimate?+
The Deurenberg formula gives a rough estimate. For precise figures use calipers, DEXA or hydrostatic weighing.
All calculations run locally in your browser. Nothing you type is sent to a server.