Body Fat Calculator (Navy Method)

US Navy body fat method

The US Navy circumference method estimates body fat from neck and waist measurements (plus hips for women). It's not as accurate as DEXA scans (1-3% margin of error) but is the most reliable home method without scales or calipers. The formula was developed by the Naval Health Research Center in the 1980s and is still used for military fitness standards.

Body fat categories

How to measure accurately

• Neck: Just below the larynx (Adam's apple), with tape level all around.
• Waist (men): At the navel level, relaxed (don't suck in).
• Waist (women): Smallest point above the navel, usually 1-2 inches above the navel.
• Hips (women): Largest point around buttocks, feet together.
• Use a soft cloth tape measure. Avoid pulling tight — should rest on skin.
• Measure first thing in the morning before eating for consistency.