Body Fat Calculator

Estimate your body fat percentage using the U.S. Navy Method. This tool works for both men and women and supports inches or centimeters for all inputs.

Body Fat Summary

Body Fat Percentage

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Body Fat Mass

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Lean Body Mass

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What is Body Fat Percentage?

Body fat percentage refers to the proportion of fat in your body compared to everything else—muscles, bones, organs, and water. Tracking your body fat helps you monitor fitness progress and improve health.

How to Calculate Body Fat?

We use the U.S. Navy Method, which estimates body fat based on neck, waist, and height measurements. For women, hip circumference is also required. The formulas differ slightly between genders and are known for their simplicity and surprising accuracy.

U.S. Navy Method Formula:
For Men:
Body Fat % = 86.010 × log10(Waist − Neck) − 70.041 × log10(Height) + 36.76For Women:
Body Fat % = 163.205 × log10(Waist + Hip − Neck) − 97.684 × log10(Height) − 78.387

Why Use This Calculator?

  • Gives a reliable body fat estimate without expensive tools
  • Supports both Imperial and Metric units
  • Ideal for fitness tracking, weight loss, or strength training
  • Free to use, no sign-up required

Frequently Asked Questions

Is this body fat calculator accurate?

While not as precise as DEXA scans, the U.S. Navy Method offers a solid estimate and is widely used in fitness assessments.

Do I need to convert measurements?

No — just select your preferred units for each field (inches/cm, pounds/kg), and the calculator handles everything.

What is a healthy body fat percentage?

For men, 10–20% is considered healthy. For women, 18–28% is a good target. Athletes may be lower.

Does age matter?

Yes, but this calculator doesn’t factor age in directly. However, general fitness guidelines vary by age group.