Gender
Method
Waist (cm)
Neck (cm)
Hip (cm) — females only
Height (cm)
BMI (for Deurenberg method)
Age (for Deurenberg method)
Body fat results (click to copy)
Frequently Asked Questions
How accurate is the US Navy method?
The US Navy circumference method has a margin of error of ±3–4 percentage points for most people. It's less accurate than DEXA scan (gold standard) or hydrostatic weighing, but much more accessible. Consistency matters more than absolute accuracy — use the same method each time.
How do I measure correctly?
Waist: measure at the navel, relaxed (not sucked in). Neck: measure below the larynx (Adam's apple), sloping slightly downward. Hip (females): widest point around buttocks. Use a flexible tape measure, not a rigid ruler. Measure in the morning before eating.
What is a healthy body fat percentage?
For men: 6–13% (athletic), 14–17% (fitness), 18–24% (average). For women: 14–20% (athletic), 21–24% (fitness), 25–31% (average). Below essential fat levels (2–5% men, 10–13% women) causes health problems. Very lean doesn't necessarily mean healthier.
Is body fat better than BMI?
Yes, in most cases. BMI doesn't distinguish between muscle and fat. A muscular person can have a high BMI but very low body fat. Body fat percentage directly measures body composition. However, BMI is simpler to calculate without measurements.