Body Fat % Calculator (Navy Method)
Estimate body fat percentage using the US Navy circumference method. Enter height, neck, waist (and hip for women) measurements in centimetres.
How to use this tool
- Enter sex, height, neck circumference, waist circumference, hip circumference (women) and body weight (optional) in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your body fat % and the full breakdown beneath it.
The US Navy circumference method estimates body fat from simple tape measurements without calipers or DEXA. It is widely used in military fitness assessments.
This is an estimate only. DEXA scanning or hydrostatic weighing provide more accurate measurements. Not medical advice.
Frequently asked questions
- How accurate is the Navy method?
- Studies put the margin of error at ±3–4% compared with DEXA. It is less accurate for very lean or very obese individuals.
- Where do I measure the waist?
- For men: at the navel. For women: at the narrowest point. Keep the tape level and breathe normally — don't suck in.