Estimate adult body-fat percentage with the U.S. Navy circumference method and compare fat mass, lean mass, and a general category.
Enter measurements
Your estimate
Measurement tip: Keep the tape level and snug without compressing the skin. Repeat measurements and use the average.
General adult body-fat categories
| Category | Men | Women |
|---|---|---|
| Essential fat | 2–5% | 10–13% |
| Athletic range | 6–13% | 14–20% |
| Fitness range | 14–17% | 21–24% |
| Average range | 18–24% | 25–31% |
| Higher range | 25%+ | 32%+ |
How the estimate works
The circumference method relates height to neck and waist measurements for men, and to neck, waist, and hip measurements for women. It is practical but less precise than laboratory techniques. Hydration, tape placement, breathing, and body shape can affect the result.
Frequently asked questions
Is this a medical measurement?
No. It is a screening estimate and should not replace professional assessment.
Why can results differ from a smart scale?
Smart scales use bioelectrical impedance, while this calculator uses circumferences. Both methods have distinct assumptions and error ranges.
How should waist be measured?
Measure consistently after a normal exhale, with the tape horizontal and without pulling it tight.