How to use it
Pick Male or Female, choose cm or inches, then take three quick tape measurements: height, neck and waist. Women also add hip. The calculator returns your body fat percentage and category the moment the numbers make sense — no scale, no calipers, no calculate button.
Tap Go advanced to add your age and weight. That unlocks a BMI-method estimate next to the Navy figure, plus your fat mass and lean mass in kg or lb.
The US Navy tape method
The Navy method estimates body fat from body circumferences rather than a scale reading. Because it looks at where you carry fat — the waist for men, waist and hips for women — it tends to track real body composition better than height-and-weight rules alone.
Measure with a flexible tape, relaxed and level, without pulling it tight. Neck just below the larynx; waist at the navel for men and at the narrowest point for women; hip at the widest point. Measure twice and average.
Army & navy body fat standard
The army and navy body-composition test uses the same tape-measure circumference method built into this calculator. If you need to check yourself against a service standard, this is a fast, private way to see roughly where you land before an official measurement — just remember the services round and follow their own procedure.
Prefer to train by numbers?
Pair this with our Heart Rate Zone Calculator to set your fat-burning Zone 2, or plan runs with the Pace Calculator.
Body fat categories — men
| Category | Men · body fat |
|---|---|
| Essential fat | 2–5% |
| Athletes | 6–13% |
| Fitness | 14–17% |
| Average | 18–24% |
| Obese | 25%+ |
Body fat categories — women
| Category | Women · body fat |
|---|---|
| Essential fat | 10–13% |
| Athletes | 14–20% |
| Fitness | 21–24% |
| Average | 25–31% |
| Obese | 32%+ |
Women carry more essential fat than men — it's biologically necessary — so healthy ranges sit higher. Ranges shown follow common ACE guidelines and are general reference points, not medical thresholds.
Navy vs BMI method
The BMI method estimates body fat from height, weight and age only, so it can mislabel a lean, muscular person as high-fat. The Navy tape method reads your actual shape. Advanced mode shows both so you can see the gap for yourself.
Common questions
How does the US Navy body fat calculator work?
It estimates body fat from a few tape-measure circumferences instead of a scale. Men enter height, neck and waist; women also add hip. The Navy formula converts those into a body fat percentage — the same circumference method behind the army and navy body-composition standards.
What's a healthy body fat percentage for men and women?
Women naturally carry more essential fat than men. Using common ACE ranges, men are about 14–17% in the fitness range and 18–24% average; women are 21–24% fitness and 25–31% average. Below those is athletic or essential; above is classed as obese.
How do I measure my neck, waist and hip?
Use a flexible tape, relaxed and level, without pulling tight. Neck just below the larynx; waist at the navel (men) or narrowest point (women); hip at the widest point. Measure each twice and average.
Is the Navy method or the BMI method more accurate?
The Navy tape method reads where you actually carry fat, so it usually beats the BMI method, which uses only height and weight and can mislabel muscular people. Neither matches a DEXA scan, but Navy is a solid free estimate. Advanced mode shows both side by side.
Does this work for the army or navy body fat standard?
Yes — the army and navy tape test uses the same circumference method this calculator implements, so it's a good pre-check. Official assessments round and follow their own procedure, so treat this as a close estimate.