Body Fat Calculator

Estimate your body fat percentage using the U.S. Navy formula from waist, neck, and hip measurements.

What is a Body Fat Calculator?

Estimate your body fat percentage using the U.S. Navy method.

Enter your measurements to see fat mass, lean body mass, and fitness classification.

How to Calculate Body Fat

Follow these steps:

  • Choose your preferred unit system.
  • Select your gender.
  • Enter your height, weight, waist, and neck measurements.
  • Women should also enter their hip measurement.
  • Click calculate to see your body fat percentage.

Tips

  • Measure in the morning for consistency.
  • Take multiple measurements and average them.
  • Track trends over time rather than focusing on the absolute number.

Frequently Asked Questions

How does the U.S. Navy method work?+
The U.S. Navy body fat formula uses circumference measurements (waist, neck, and hips for women) combined with height to estimate body fat percentage. It is fairly accurate for most people and requires no specialized equipment.
How do I measure correctly?+
Waist: measure at the narrowest point (at navel level for men). Neck: measure below the larynx. Hips (women only): measure at the widest point. Use a soft tape measure, keep it snug but not compressed, and measure in the morning.
What is a healthy body fat percentage?+
Men: 10-20% is considered fit, 6-13% for athletes. Women: 18-28% is fit, 14-20% for athletes. Essential fat minimums are about 2-5% for men and 10-13% for women.

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Body Fat Calculator — free online body fat calculator, body fat percentage, us navy method, fat mass, lean body mass. No signup required. Works in your browser.