Health
Body Fat Calculator
Estimate body fat percentage.
Biological sex
Body fat
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Fat mass
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Lean mass
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Fitness category (ACE)
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FAQ
- What is the US Navy body fat method?
- The US Navy method estimates body fat percentage using height and circumference measurements (neck, waist, and hip for women). It applies a logarithmic formula originally developed for use in the US military, providing a reasonable estimate without requiring calipers or underwater weighing.
- How accurate is this calculator?
- The US Navy formula is generally accurate within 3-4 percentage points compared to DEXA scan results for most people. Accuracy can decrease at very high or very low body fat levels. For clinical-grade measurement, consider a DEXA scan or hydrostatic weighing.
- Is my data sent anywhere?
- No. All calculations run entirely in your browser; no data is uploaded or stored.