Three methods. One number. Your choice. All calculations run in your browser — we never see your data.
This estimator combines three validated methods to give you a range of body fat percentages. The Navy Method uses neck and waist circumference — fast, free, and requires only a tape measure. The YMCA Method simplifies further with just weight and waist. The Jackson-Pollock Skinfold method uses caliper measurements at 3 or 7 sites and is the most accurate home option when performed correctly. Each method has known error margins (shown in your results). We recommend using 2-3 methods and comparing the range rather than trusting any single number.
Tip: Measure at the same time of day, under the same conditions. Hydration and meal timing can shift readings by 1-3%.
Compare your measurements over time. Data is stored locally in your browser.
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See how your BMI and body fat compare.
Calculate lean mass from your results.
Log your skinfold measurements over time.
The Jackson-Pollock 7-site skinfold method is the most accurate home option (±3-5% error). The Navy Method is fastest but less precise (±4-6%).
Yes, you need a pair of skinfold calipers. A basic Lange or Harpenden-style caliper costs $15-30. Self-measurement adds about ±8% error.
Each method measures different things and uses different equations. Navy uses circumference, YMCA uses weight+waist, skinfold measures fat thickness. Use 2-3 methods and compare the range.
No. These are estimates based on population equations. For medical-grade accuracy, get a DEXA scan (±1-2% error).