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Body Fat Calculator

Estimate your body fat percentage using the US Navy method or BMI-based formula. Enter your measurements to get your body fat category and ideal weight range.

Used 28.4K times today

How to Use Body Fat Calculator

  1. 1

    Enter your basic measurements

    Provide your gender, age, height, and weight. These establish your baseline body composition context.

  2. 2

    Input circumference measurements

    Using a soft measuring tape, measure your waist, neck, and (for women) hips at the correct anatomical landmarks. Enter those values for the most accurate result.

  3. 3

    Review your body fat percentage

    See your estimated body fat percentage, your body fat category (essential fat, athlete, fitness, acceptable, or obese), and your lean mass weight.

Frequently Asked Questions

How accurate is the US Navy body fat formula?
The US Navy method is one of the most practical field-based estimation methods, with a typical margin of error of 3–4%. It is more accurate than BMI alone but less precise than hydrostatic weighing or DEXA scans.
What is a healthy body fat percentage?
Healthy body fat ranges differ by gender. For men, 8–19% is generally considered healthy. For women, 21–33% is the healthy range. Athletes often fall below these ranges while maintaining excellent health.
How do I measure my waist correctly?
Measure your waist at the narrowest point of your midsection, usually just above the navel. Exhale normally and measure without sucking in your stomach for an accurate reading.

About Body Fat Calculator

The Body Fat Calculator on Utilko uses the validated US Navy circumference method to estimate your body fat percentage without expensive equipment. By measuring a few key points on your body with a tape measure, you can get a reliable assessment of your body composition in seconds.

Body fat percentage is a far more informative health marker than weight or BMI alone because it distinguishes between fat mass and lean mass (muscle, bone, and organs). Understanding your body composition helps you set smarter fitness goals and track real progress. All calculations run in your browser with no data stored.

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