BODY COMPOSITION
Body Fat Percentage Calculator
Estimate body fat percentage with the U.S. Navy circumference method.
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Result
Body Fat Position
Estimate placed against general fitness reference bands.
How to use it
- The Navy Method requires waist circumference (measured at navel level), neck circumference (just below the larynx), and for women, hip circumference (at the widest point). Use a flexible tape, not rigid. Measure twice and average.
- Your result has a ±3–5% margin. Healthy ranges: men 10–20%, women 18–28%. Athletic: men 6–13%, women 14–20%. Essential fat (minimum for organ function): men 2–5%, women 10–13%.
- Most measurement errors come from the waist: measure at navel level while standing relaxed — not sucking in. Measuring lower (at the hip) will underestimate body fat significantly.
- Body fat percentage tells you composition; BMI tells you mass relative to height. A muscular person will show normal/athletic body fat with an overweight BMI. Always compare both metrics.
- Track at the same time of day (morning, before eating) with consistent measurement positions. Single readings are unreliable — compare monthly averages of 3 consecutive morning measurements.
Questions people usually ask
How accurate are body fat estimation methods?
DEXA scan: ±1-2% (gold standard, requires equipment). Hydrostatic weighing: ±2-3%. BodPod (air displacement): ±2-3%. Skinfold calipers (trained user): ±3-5%. Bioelectrical impedance (home scales): ±5-8%, highly variable with hydration. This calculator uses the Navy Method (circumference-based), typically ±3-5%.
What is a healthy body fat percentage?
For men: essential fat 2-5%, athletic 6-13%, fitness 14-17%, average 18-24%, obese 25%+. For women: essential fat 10-13%, athletic 14-20%, fitness 21-24%, average 25-31%, obese 32%+. Women require higher essential fat due to hormonal and reproductive function.
Why does my body fat percentage seem high even though I exercise?
Exercise alone rarely produces large fat loss without a calorie deficit. Cardio burns 200-400 calories per session — easily offset by diet. Resistance training adds muscle but may not reduce fat significantly without dietary control. Fat loss requires a sustained calorie deficit regardless of exercise type.
How quickly can I reduce body fat percentage?
Sustainable fat loss is 0.5-1% of body weight per week. A 180 lb person can lose roughly 1-1.5 lb per week on a 500-750 calorie deficit. Faster loss accelerates muscle loss. Body fat percentage dropping 1-2 points per month is excellent progress; 3+ months is needed for visible changes.
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