Enter your data to calculate your body fat percentage based on your age and sex. Use a period as a decimal separator.
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Body fat percentage is an estimate of the proportion of fat in relation to total body weight. It uses BMI as a reference and incorporates sex and age for a more accurate estimate.
For an accurate measurement, body composition must be assessed in a laboratory with specialized equipment.
This calculator uses the Deurenberg equation (1991) to estimate body fat percentage from BMI, age and sex. It was published in the British Journal of Nutrition and is one of the most widely used formulas when a direct body-composition measurement is not available. The last term changes with sex: -16.2 for men and -5.4 for women.
Men: 1.2 × BMI + 0.23 × age − 16.2
Women: 1.2 × BMI + 0.23 × age − 5.4
The ranges in this table are based on the study by Gallagher et al. (2000), published in The American Journal of Clinical Nutrition. They relate body fat percentage in women to the BMI cut-offs of the WHO and the NIH, grouped by age.
| Age | Normal | Overweight | Obesity |
|---|---|---|---|
| 18-39 | 21-33% | 33-39% | +39% |
| 40-59 | 23-35% | 35-40% | +40% |
| 60-79 | 24-36% | 36-42% | +42% |
The ranges in this table are based on the study by Gallagher et al. (2000), published in The American Journal of Clinical Nutrition. They relate body fat percentage in men to the BMI cut-offs of the WHO and the NIH, grouped by age.
| Age | Normal | Overweight | Obesity |
|---|---|---|---|
| 18-39 | 8-20% | 20-25% | +25% |
| 40-59 | 11-22% | 22-28% | +28% |
| 60-79 | 13-25% | 25-30% | +30% |