METHOD
Formula and method
Body fat % = 1.20 × BMI + 0.23 × age − 10.8 × sex coefficient − 5.4.
Body fat percentage estimate with the Deurenberg formula
A rough body-fat estimate from BMI, age and a formula coefficient.
01
Your inputs
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02
Your result
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About this result
The 1991 Deurenberg BMI model has substantial individual error. This is not a body-fat measurement. The study standard error of 4.1 percentage points is not your individual confidence interval. Educational estimate, not a diagnosis or individual plan. Discuss health decisions with a qualified healthcare professional.
Full disclaimerHow can body fat percentage be estimated?
The calculator first works out BMI from weight and height, then estimates body fat with 1.20 × BMI + 0.23 × age minus 10.8 × sex coefficient minus 5.4, where the coefficient is 1 for men and 0 for women. The 1991 model has a large individual error, with a study standard error of 4.1 percentage points, and it is not a measurement. It works for adults aged 18 to 83 with a BMI from 13.9 to 40.9. Ask a doctor for a real measurement and advice.
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