Body Fat Percentage Calculator
Estimate body fat percentage with the US Navy circumference method or a BMI-based estimate.
15–120 years
At navel level
Just below the larynx
Result
—
Enter measurements, then click Calculate.
Circumference measurements in inches. BMI-based fallback uses Deurenberg: BF% = 1.20×BMI + 0.23×age − 10.8×sex − 5.4.
Navy (tape measure) or BMI estimate.
Waist, neck, and hip (women) for Navy; height/weight/age for BMI.
Body fat %, fat mass, lean mass, and category band.
Waist 34 in, neck 15 in, height 5'10".
Body fat ≈ 17.5% (fitness category).
Measuring waist too high or low
Fix: Measure at navel level for Navy consistency.
Expecting DEXA accuracy
Fix: Treat results as ±3–4% estimates.
Estimate body fat percentage with the US Navy circumference method or a BMI-based estimate.
15–120 years
At navel level
Just below the larynx
Result
—
Enter measurements, then click Calculate.