How to Measure Body Fat at Home
The US Navy circumference method requires just a tape measure and three (men) or four (women) body measurements. It is considerably more accurate than BMI-based methods because it accounts for where fat is stored on your body. The accuracy is approximately ±3–4% compared to DEXA scanning.
How to Take Measurements Correctly
Waist: Stand relaxed and breathe out normally. Measure at the narrowest visible part of your waist — usually at the navel or just above it for men, and at the narrowest point of the torso for women. Do not suck in your stomach. Neck: Measure just below the larynx (Adam's apple) with the tape angled slightly downward at the front. Hips (women): Measure around the widest part of your hips and buttocks while standing with feet together.
Healthy Body Fat Ranges
| Category | Men | Women |
|---|
| Essential Fat | 2–5% | 10–13% |
| Athletic | 6–13% | 14–20% |
| Fit | 14–17% | 21–24% |
| Acceptable | 18–24% | 25–31% |
| Obese | 25%+ | 32%+ |
Why Women Have Higher Body Fat
Women naturally carry more essential fat than men due to reproductive hormones (estrogen), breast tissue, and biological requirements for healthy reproduction. This is why healthy body fat ranges are higher for women across all categories. A woman at 25% body fat is in the "acceptable" range, while a man at 25% would be classified as obese.
Frequently Asked Questions
What is a healthy body fat percentage?
For men: 6–13% is athletic, 14–17% is fit, 18–24% is acceptable. For women: 14–20% is athletic, 21–24% is fit, 25–31% is acceptable. Essential fat (needed for basic body functions) is 2–5% for men and 10–13% for women. Athletes often maintain lower body fat than average.
How accurate is the Navy body fat method?
The US Navy circumference method is accurate to approximately ±3–4% compared to DEXA scanning (the gold standard). It's more accurate than BMI-based estimates because it accounts for body shape. Measurement errors are the most common source of inaccuracy — be precise with your tape measure placements.
What is the difference between fat mass and lean mass?
Fat mass is the weight of all fat tissue in your body. Lean mass (also called fat-free mass) includes muscles, bones, organs, skin, blood and water — everything that isn't fat. If you weigh 80kg with 20% body fat, your fat mass is 16kg and lean mass is 64kg. Increasing lean mass through strength training raises your metabolic rate.
How often should I measure body fat?
Every 4–8 weeks is typically sufficient for tracking progress. Body fat changes slowly with consistent diet and exercise. Daily fluctuations in water retention, food intake and measurement location can cause apparent changes of 1–2% that aren't real changes in fat tissue.