Body Fat Calculator
US Navy body fat estimate.
About this tool
The US Navy method estimates body fat from a few simple tape measurements. It's used by armed forces around the world because it's quick, free, and reliably tracks change over time.
For absolute accuracy, DEXA, BodPod, or hydrostatic weighing are the gold standards. For tracking your trend at home, this is the practical choice.
Frequently asked questions
How do I measure my neck?
Around the narrowest point, below the larynx (Adam's apple), with the tape level all the way around.
How do I measure my waist?
Men: at the navel. Women: at the narrowest point of the natural waist.
Why does it ask hip measurement for women only?
Women's body fat distribution differs, so the Navy formula uses an extra measurement to improve accuracy.
⚕️ Educational only — not a substitute for professional medical advice, diagnosis, or treatment. In an emergency call your local emergency services.