How does the Body Fat Calculator work?
First, BMI is calculated: weight ÷ height(m)². Then the Deurenberg formula: BF% = 1.2 × BMI + 0.23 × age − 10.8 × sex − 5.4 (sex: 1 = male, 0 = female). Accuracy ±3–5 percentage points.
Body Fat Calculator
What is your body fat percentage? Enter your weight, height and age to get your body fat % using the scientific Deurenberg formula – no skinfold calipers needed.
Your details
years
1480+
cm
100250+
kg
30300+
Result
Body fat (%)
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Fat mass (kg)
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Lean mass (kg)
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Frequently asked questions
What is a normal body fat percentage? ▾
For men, 10–20% is fit, 20–25% is normal. For women: 18–28% fit, 25–35% normal. Athletes often have 6–13% (men) or 14–20% (women).
How accurate is the BMI-based method? ▾
The Deurenberg formula has an accuracy of ±3–5 percentage points. For more precise measurement, DEXA scan, hydrodensitometry or BIA scales are recommended.
Why is body fat percentage more important than weight? ▾
Two people with the same weight can have very different body compositions. Muscle weighs more than fat – someone who exercises may be heavier but have less body fat.
Not financial or medical advice. No warranty.