Body fat calculator (US Navy tape method)
Estimate body fat percentage from circumference measurements with the US Navy / Hodgdon method. Useful for tracking trends — not a substitute for DEXA.
Estimated body fat
22.4%
Expect roughly ±3–4% versus DEXA for many people; treat it as a trend tool.
How to measure
- 01
Measure consistently
Use a tape at the same time of day, same sites.
- 02
Enter height and circumferences
Neck and waist for men; add hips for women.
- 03
Track the trend
Re-measure monthly and log body metrics in Vytal.
FAQ
- How accurate is the Navy method?
- Often within a few percentage points of lab methods for many people, but individual error can be larger.
- Is this medical advice?
- No. It is an estimate for fitness tracking only.
- Why do women need hip measurement?
- The female Navy equation includes hips in addition to neck and waist.
- Can I log body fat in Vytal?
- Yes. Track body weight, body fat %, and progress photos in one place.
Related tools
Estimates only — not medical advice. Talk to a qualified professional before changing your training or nutrition.