What Does Body Fat Percentage Mean?
Body fat percentage is the total mass of fat divided by total body mass. Unlike Weight or BMI (Body Mass Index), which don't distinguish between muscle and fat, estimating your tissue composition gives a much clearer picture of your overall health.
A competitive bodybuilder might have a BMI of 30 (technically "obese"), but a body fat percentage of 8% ("athlete"). Conversely, someone with "normal weight obesity" might have a normal BMI but high body fat percentage. Focus on composition, not just the scale weight.
The US Navy Method
Determining body fat with 100% accuracy requires a DEXA scan or hydrostatic weighing, both of which are expensive and inaccessible. The US Navy Method used here uses a tape measure to compare circumference measurements. It's surprisingly accurate (usually within 1-3% of DEXA) if measured correctly.
How to Measure Correctly
For the best results with this calculator, use a flexible tape measure:
- Neck: Measure below the larynx (Adam's apple). Keep the tape flat but not tight.
- Waist (Men): Measure at the navel level.
- Waist (Women): Measure at the narrowest point of the waist.
- Hips (Women only): Measure at the widest point of the buttocks.