Body Fat Percentage Calculator

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

Body Fat Percentage Calculator

This calculator uses the U.S. Navy method to convert body measurements into a body-fat estimate and can also provide a BMI snapshot for context.

Use the result as a progress metric, not a medical diagnosis. Compare in the same conditions (time of day, hydration, measurement method).

Method and source:U.S. Navy body-fat method

Last reviewed: July 2026

How to use this calculator

Use the calculator as a practical starting point, then apply the result in the context of your training, recovery, and individual response.

  1. 1Enter the requested measurements or performance data.
  2. 2Choose the units and options that match your situation.
  3. 3Calculate, review the method and limitations, and adjust sensibly.

Frequently asked questions

How does this calculator work?

The U.S. Navy method uses waist, neck, and hip circumference along with body weight and height to estimate body-density-based body fat.

How accurate is this calculator?

Expect some margin of error by body type, gender, and measurement consistency; trend changes over time are most useful.

Using your results

Every calculated 1RM is an estimate. Use the range as a training guide, and choose working weights that match your experience, technique, and current condition.

Safety tips

  • Warm up thoroughly before attempting heavy lifts.
  • Use controlled movement and proper technique.
  • Use a spotter or safety equipment for near-maximal lifts.
  • Increase the load gradually to reduce injury risk.
  • Stop if you feel pain and allow enough time for recovery.

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