Body Fat Calculator
Circumference measurements are more useful than BMI alone — but any estimate is approximate, not a medical test.
Choose a method
Reference ranges (general adults)
- Essential fat: ~2–5% men · ~10–13% women
- Athletes: ~6–13% men · ~14–20% women
- Fitness: ~14–17% men · ~21–24% women
- Average: ~18–24% men · ~25–31% women
About this body fat calculator
Body fat percentage estimates how much of your weight is fat versus lean tissue. It often tells a richer story than BMI alone, especially for active adults.
This tool offers Navy tape-measure method (waist, neck, hip) and a BMI-based estimate when measurements are unavailable.
Results are approximations — DEXA scans and professional assessments are more precise.
Frequently asked questions
What is a healthy body fat percentage? +
Rough guides: men 10–20%, women 18–28% for general health. Athletes run lower; essential fat minimums are higher for women.
Navy method vs BMI estimate? +
Tape measurements usually beat BMI-based body fat estimates when done correctly. Measure at the same time of day for consistency.
How often should I measure body fat? +
Monthly is enough for most people. Daily fluctuations reflect water, not true fat change.
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