Body Fat Calculator (U.S. Navy Method)
Estimate your body fat percentage, category, and lean mass using just a tape measure.
Body Fat Calculator
U.S. Navy method — estimate your body fat %
Measure neck below the larynx, waist at the navel, and hip at the widest point — wrap the tape snug but not tight.
Understanding Your Results
Body fat percentage tells you what your body weight is actually made of — muscle, organs, and bone versus stored fat. This is a far more honest number than BMI or even the bathroom scale alone, since two people at the same weight and height can have very different body compositions.
The Navy method uses circumference measurements rather than skinfold calipers or expensive scanning, trading a small amount of precision for something you can repeat consistently at home with just a tape measure — making it genuinely useful for tracking change over months, not just a single snapshot.
If your result fell in the "Athletic" or "Essential Fat" range, your focus should likely shift toward building or maintaining muscle rather than further fat loss. If you landed in "Average" or "Obese," a structured calorie deficit paired with strength training will move this number down while protecting the muscle you already have.
Re-measure every 4–6 weeks using the same tape, the same time of day, and the same level of tightness — small measurement inconsistencies can swing the result by a percentage point or two, so consistency in how you measure matters more than chasing a perfectly precise single number.
Frequently Asked Questions
It is generally within 3–4% of more expensive methods like DEXA scans or hydrostatic weighing for most body types, making it one of the more reliable tape-measure methods available without specialised equipment. It can be less accurate for very lean athletes or people with unusual body proportions.
The Navy formula uses different measurement points and constants for men and women because fat distribution patterns differ by sex — women naturally carry more essential fat and store it differently around the hips, which the formula accounts for by including a hip measurement for women only.
Measure your neck just below the larynx (Adam's apple), keeping the tape level. Measure your waist at the navel, not at the narrowest point of your torso. For hip (women), measure at the widest point around your buttocks. Keep the tape snug against the skin without compressing it.
They measure different things — BMI flags whether your overall weight is in a risky range for your height, while body fat percentage tells you what that weight is actually made of. Used together, they give a far more complete picture than either alone, especially for muscular or very lean people where BMI can mislead.
For most people, the "Fitness" or "Average" categories shown above represent a sustainable, healthy range. Chasing "Athletic" or "Essential Fat" ranges year-round is typically only appropriate for competitive athletes, since maintaining very low body fat usually requires restrictive eating that is hard to sustain long-term.
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