Published on August 08, 2026 • Last updated August 08, 2026
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Body Fat Percentage is the proportion of your total body weight that comes from fat, as opposed to muscle, bone, organs, and water.
Two people can have the exact same weight, height, and even the same BMI — while having very different amounts of body fat. Body Fat Percentage fills that gap by estimating how much of your total weight is actually fat tissue, versus lean mass like muscle, bone, and organs. This distinction matters because fat and muscle affect health very differently.
A person with a high proportion of muscle can weigh more, and even register a higher BMI, while being metabolically healthier than someone at the same weight made up mostly of fat — which is why athletes are often advised to look at body fat percentage rather than BMI alone. One widely used way to estimate body fat percentage without expensive equipment is the U.S. Navy method, which uses simple tape-measure readings — waist, neck, and (for women) hip circumference — along with height, plugged into a formula validated against more precise lab methods like DEXA scans.
Healthy ranges differ by sex and age, since women naturally carry more essential fat than men; typical "fit" ranges are often cited as roughly 14-24% for women and 6-17% for men. Tracking body fat percentage over time — rather than just body weight — gives a clearer picture of fitness progress, since it's possible to lose weight without losing fat, or gain muscle while your weight stays flat.
Learn how Body Fat Percentage is calculated
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Body fat percentage is a more accurate measure of health than BMI. But how is it calculated, what is a healthy range for men and women, and which measurement method is most accessible? This guide covers everything.
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