Body Fat Percentage Calculator
Estimate body fat % from measurements using the US Navy method.
How to use this tool
- Choose sex.
- Enter height, neck and waist (and hip for women) in cm or inches.
- Calculate your estimated body fat % and category.
How it works
The Navy formula computes body density from circumferences and height, then converts to a body-fat percentage via the standard regression.
Tips
- Measure three times and average for reliability.
- Always measure at the same time of day for trends.
Limitations
A field estimate; accuracy depends on measurement consistency, and athletic/very lean individuals can get skewed results.
Frequently asked questions
How does the Navy method work?
It uses circumference measurements and height to estimate density, then converts to body fat %. It's a widely used field method.
How accurate is it?
Within a few percent for most people when measured correctly; hydrostatic or DEXA remain the references.
Where should measurements be taken?
Waist at the navel, neck below the larynx, hips (women) at the widest point — all relaxed, not 'sucked in'.