Estimate body fat with just a tape measure
The U.S. Navy tape method — widely validated, accurate to ±3%, and free to do at home.
Measurements
Tip: use a non-stretch tape measure, measure in the morning, and keep the tape level. Average three measurements per site for accuracy.
Your body fat
The U.S. Navy tape method is typically accurate to within ±3% of lab gold standards like DEXA. Keep the same measurement technique week to week to track trends reliably.
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Frequently asked questions
How accurate is the U.S. Navy body-fat method?+
Compared with DEXA (the lab gold standard), the Navy method is typically accurate to within ±3% body fat for most adults. It's less precise than DEXA or BodPod but far more accurate than calliper-free visual estimates — and it's free and repeatable at home.
What's a healthy body fat percentage?+
For men, 14–24% is the typical 'fitness/average' range; for women, 21–31%. Athletes sit lower, and going too low (below 5% male / 13% female) compromises essential fat for hormone production.
Do I need calipers for this?+
No — this is the tape-measurement method. You only need a flexible non-stretch tape measure and a few minutes.
Where exactly do I measure?+
Waist: horizontally at the navel, relaxed (not sucked in). Neck: just below the larynx, slanting slightly forward. Hip (women only): at the widest point of the hips. Morning measurements are most consistent.
How is this different from BMI?+
BMI uses only height and weight and can't tell fat from muscle. Body-fat percentage directly estimates adipose tissue and is a better indicator of health in muscular individuals.