Body Fat Percentage Calculator
Estimate body fat percentage using the U.S. Navy method.
Height
Neck
Waist
Body Fat
17.8%
Category
Average
Estimated using the U.S. Navy circumference method. Accuracy varies by body type — for precise readings, consider a DEXA scan or skinfold measurement.
How this calculator works
The U.S. Navy method estimates body fat from a log-based formula using neck, waist and (for women) hip circumference relative to height — no calipers or scanning equipment needed, just a tape measure. It was developed for military fitness screening and is popular because it's simple and repeatable.
Measure at the narrowest point of your waist and directly below your Adam's apple for the neck, using a soft tape pulled snug but not tight. Measuring at the same time of day, on an empty stomach, gives the most consistent readings over time.