FreeNo signup
Body Fat Calculator
Estimate body-fat percentage using the adult Deurenberg equation based on BMI, age, and sex.
- Estimated body fat, %
- 18.1
- Estimated fat mass, kg
- 12.7
How the calculation works
Body fat, % = 1.20 × BMI + 0.23 × age − 10.8 × S − 5.4; S = 1 for men and 0 for women.
Inputs
- Weight, kg
- Height, cm
- Age, years
- Sex used by the equation
Calculation details
An adult estimate, not for children, pregnancy, or a personal treatment plan. Discuss results with a clinician or dietitian when managing illness or changing your diet.
This population model has substantial individual error and does not measure body composition. It is unsuitable for diagnosing conditions or tracking athletes’ body composition.
Related calculators
- BMI Calculatorbmi calculatorOpen →
- BMR Calculatorbmr calculatorOpen →
- Calorie Deficit Calculatorcalorie deficit calculatorOpen →
- Calorie Needs Calculatorcalorie calculatorOpen →
- Calories Burned Calculatorcalories burned calculatorOpen →
- Ideal Weight Range Calculatorideal weight calculatorOpen →
Other sections
Updated: 2026-10-02