Free calculators and unit converters for general and everyday use.
Our online tools will provide quick answers to your calculation and conversion needs. On this page, you can calculate body fat percentage using your body mass index (BMI) value.
Android: Use this fat calculator offline with our all-in-one calculator app.
The body fat percentage is a measure of fitness level; The calculation on this page use the formula derived by Deurenberg and co-workers to find the amount of body fat:
Child body fat % = (1.51 * BMI) - (0.70 * Age) - (3.6 * sex) + 1.4
Adult body fat % = (1.20 * BMI) + (0.23 * Age) - (10.8 * sex) - 5.4
where, sex is 1 for males and 0 for females. Adults is taken as 15 years or older for this calculation.