How is body fat percentage calculated using the U.S. Navy method?

The U.S. Navy method calculates body fat using a formula based on measurements of the neck, waist, height, and hips (for females). It applies logarithmic calculations to estimate body fat percentage.

What measurements are needed for the Body Fat Calculator?

You need to input your gender, age, height, neck, waist, and hip measurements (hip only for females), along with your body weight.

Can I use centimeters and kilograms in the Body Fat Calculator?

Yes. The calculator accepts both metric (cm, kg) and imperial (in, lb) units. It will convert values accordingly.

Is this calculator suitable for both men and women?

Yes. The calculator supports both male and female users and adjusts the formula accordingly based on gender.

Body Fat Calculator

Q: What is a healthy body fat percentage?

For men, a healthy body fat range is typically between 10%–20%. For women, it's around 18%–28%, depending on age and fitness level.

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.

Gender

Male Female

Body Weight

Height

Neck Circumference

Waist Circumference

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) + 36.76 For 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.