Body Fat Percentage Calculator
Estimate your body fat percentage using the U.S. Navy circumference method — a practical measure of body composition that tells you more than weight alone.
What is body fat percentage?
Body fat percentage is the proportion of your total body weight that is made up of fat. Unlike body weight or BMI, it distinguishes between fat and lean tissue such as muscle, bone and water, giving a clearer picture of your body composition and fitness. Two people of the same weight and height can have very different body fat percentages depending on how much muscle they carry. This makes body fat percentage one of the most useful measures of physical condition.
How the U.S. Navy method works
This calculator uses the U.S. Navy circumference method, which estimates body fat from simple tape-measure measurements: your height, neck and waist (plus hips for women). It is a practical, no-equipment way to estimate body fat that correlates reasonably well with more expensive methods. For best accuracy, measure in the morning, keep the tape snug but not tight, and take each measurement twice and average it.
Healthy body fat ranges
Healthy body fat ranges differ between men and women, because women naturally carry more essential fat for hormonal and reproductive function. For men, roughly 14 to 24% is considered fit to average, while for women the comparable range is about 21 to 31%. Athletes often fall below these ranges, and levels above them indicate excess fat. Some fat is essential — going too low (below about 6% for men or 14% for women) can be harmful to health.
The limits of any estimate
All field methods for estimating body fat, including this one, are approximations. The Navy method can be less accurate for very muscular or very lean individuals, and for those whose fat distribution differs from the population average. For precise measurement, methods such as DEXA scans or hydrostatic weighing are the gold standard. Use this result to track trends over time rather than fixating on a single exact number.
Frequently Asked Questions
For men, a healthy body fat percentage is roughly 14 to 24%, and for women about 21 to 31%. Athletes often have lower levels. Women naturally require more essential fat than men. Levels that are too high or too low can both affect health.
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Sources & References
- 1.U.S. Navy / Hodgdon and Beckett. Prediction of percent body fat from circumference measurements.
- 2.American Council on Exercise (ACE). Percent Body Fat Norms for Men and Women.
- 3.National Institutes of Health (NIH). Assessing Your Weight and Health Risk.
LifeCheckIQ content is based on peer-reviewed research, recognised clinical guidelines, and authoritative medical sources, and is reviewed by Deborah Adotso, General Nurse, for clinical accuracy.
Medical Disclaimer: This tool is for informational and educational purposes only. Results are not a medical diagnosis. Always consult a qualified healthcare professional for medical advice, diagnosis, or treatment. In an emergency, call your local emergency number or visit the nearest hospital immediately.