Body Fat Percentage Calculator
Calculate body fat % using the US Navy method — no calipers needed.
The US Navy method uses circumference measurements (neck, waist, hips) to estimate body fat percentage. It is fast, equipment-free and reliable enough for everyday use.
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Frequently Asked Questions
How accurate is the US Navy method?
It has ±3-4% error compared to DEXA scan. For progress tracking (not absolute values) it is quite reliable — measure each time under the same conditions.
How do I measure correctly?
Neck: below the larynx. Waist: at the narrowest point. Hips (women): at the widest point. Measure in the morning before eating.
What is the ideal body fat %?
Men: 14-17% (fitness), 18-24% (average). Women: 21-24% (fitness), 25-31% (average). Athletes typically have lower percentages.
How do I track a client's body fat?
Use this tool every 4 weeks for tracking — or store measurements in FitMePlz for automatic history.