Body fat calculator (US Navy tape method)
Estimate body fat percentage, lean mass and fat-free mass index from a tape measure.
How it works
The US Navy method estimates body fat from neck, waist and, for women, hip measurements with height.
It is usually within 3-4 percentage points of a DEXA scan; the trend over months matters more than any one number.
Fat-free mass index is lean mass relative to height. Around 25 is the natural ceiling for most men.
Read more: Fat loss.
Track it every day, free
The Fit app turns these numbers into a daily plan for food, training and recovery, and adjusts them as you go. No account, and only you can read your data.