how to calculate body fat percentage

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Why body fat % matters more than BMI

Body fat percentage tells you what your weight is actually made of. Two people at 170 lbs can look — and be — completely different: one at 15% body fat is a lean athlete, one at 30% is average and probably carrying more visceral fat than they want. BMI can’t distinguish them. This guide walks through the five ways to measure body fat %, why the US Navy tape method is the best free option for most people, and how to track it reliably.

The five methods, ranked by accuracy

BMI is a two-number ratio — height and weight — that was never designed for individual diagnosis. It was built in the 1830s for population statistics. A lifter at 5'10", 200 lbs, and 12% body fat shows up as “overweight” on the BMI chart despite carrying less fat than 90% of the population. Meanwhile a sedentary office worker at the same height and 160 lbs might read as “healthy” BMI but carry 30% fat and corresponding metabolic risk.

The US Navy tape method in practice

Body fat percentage is what doctors, coaches, and insurance actuaries actually care about under the hood. If you can measure only one thing beyond the scale, measure this.

Healthy ranges

The Navy formula has been used by the US military since 1984 for PFA compliance. It works because abdominal fat is the dominant differentiator between body compositions at the same height.

How often to measure

The American Council on Exercise bands body fat percentages roughly as follows. Men: 2–5% essential, 6–13% athletic, 14–17% fit, 18–24% average, 25%+ high. Women carry more essential fat: 10–13% essential, 14–20% athletic, 21–24% fit, 25–31% average, 32%+ high. These shift slightly with age.

What actually moves the number