🏃 Health & Fitness
Body Fat Calculator
The US Navy method estimates body fat from neck, waist and hip circumferences. It needs only a tape measure and correlates closely with underwater weighing for most people, though it is less accurate at the extremes of body composition.
How it works
Sex
Height
Neck circumference
Waist circumference
Hip circumference (women)
Body weight
Body fat
Fat mass
Lean mass
Frequently asked questions
How do I use the Body Fat Calculator?
Fill in the fields above — the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.