Body Fat Calculator: The Complete Guide
Estimate your body fat percentage with just a tape measure. Enter your height, neck, and waist measurements — plus hip for women — to get your body fat percentage and fitness category using the U.S. Navy method.
Who the Body Fat Calculator is for
People tracking fitness who want a body-fat estimate without calipers or a special scale.
How to use the Body Fat Calculator
- Type your values into the fields above — pick your currency or units where the calculator offers them.
- Results update automatically as you type; there's no submit button and nothing is sent to a server.
- Adjust any input to compare scenarios, then copy the result with a single click.
How it works
The U.S. Navy method uses log-based equations on body circumferences: for men it takes waist and neck; for women it adds hip. Measurements are taken in centimetres (inches are converted automatically).
Features
- U.S. Navy tape method
- Body fat % and category
- Metric or imperial
- No special equipment
How the Navy method works
The U.S. Navy circumference method estimates body fat from the relationship between your height and key girth measurements. It's free, repeatable, and reasonably accurate for most people — far more practical than calipers. For the best results, measure relaxed, at the same spots each time, and avoid pulling the tape tight.