What the tool does, how to run it, and what to expect from the result.
The US Navy method estimates body fat from height and a few circumference measurements: neck and waist for men; neck, waist, and hip for women. It is a well-studied, equipment-free estimate, typically within a few percentage points of a DEXA scan for most body types, though less accurate at the extremes.
A quick way to understand who this helps, what it solves, and where it connects next.
Anyone tracking body composition without access to a DEXA scan or calipers.
Estimating body fat percentage with just a tape measure.
Short answers for the questions people usually have before trying a utility like this.
Yes. It is completely free, with no sign-up and no usage limits.
Studies generally show it within a few percentage points of DEXA or hydrostatic weighing for most people, though it can be less reliable for very lean or very heavy individuals.
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Enter a few tape-measure circumferences to estimate body fat percentage using the US Navy method, no scale or calipers needed.
11.1%Estimated body fat, category: Athletes
Measure at the narrowest point of the neck, at the navel for the waist, and at the widest point of the hips (women). The US Navy method is an estimate, typically within a few percentage points of a DEXA scan; it is not a medical or diagnostic measurement.