Body Fat Calculator

Estimate your body fat percentage using the proven U.S. Navy method.
Enter a few simple body measurements to see your body fat %, category, and how much fat you would need to lose to reach a healthier Fitness range.

This calculator works on desktop and mobile, supports metric and imperial units, and gives instant results.

Body Fat Calculator

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

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🔹 How to use the Body Fat Calculator

Choose units – Metric (cm / kg) or Imperial (in / lb).
Select sex – This affects the calculation method.
Enter your measurements:
- Height
- Neck
- Waist
- Hip (required for women)
- Weight (optional, but recommended for goal calculations)
Click Calculate.
View your body fat percentage, category, visual scale, and goal estimate if applicable.
Use the button to continue to the Calorie Calculator if you want help planning fat loss.

🔹 What does the result mean?

Your result includes:

Body fat percentage – An estimate of how much of your body weight is fat.
Category – Based on ACE (American Council on Exercise) ranges:
- Essential
- Athletes
- Fitness
- Average
- High
Visual scale – Shows where you fall compared to healthy ranges.
Goal estimate – If your body fat is above the Fitness range, you’ll see:
- Estimated target body fat %
- Approximate fat mass to reduce
- Estimated target weight (assuming lean mass stays the same)

Is this body fat calculator accurate?

This calculator provides a reasonable estimate using the U.S. Navy circumference method. While not as precise as medical tests like DEXA, it is considered one of the most accurate home methods.

Why does the calculator ask for neck and waist measurements?

The U.S. Navy method uses body circumference measurements instead of weight alone, making it more reliable than BMI-based estimates.

Why is hip measurement required for women?

Body fat distribution differs between men and women. For women, the formula includes hip circumference for better accuracy.

Is BMI better than body fat percentage?

BMI only compares height and weight and does not distinguish between fat and muscle. Body fat percentage gives a more meaningful picture of body composition.

Can I use this calculator on mobile?

Yes. The calculator is fully responsive and works on mobile, tablet, and desktop.

Does Eqsy store my health data?

No. All calculations are done locally in your browser. No personal or health data is stored or sent anywhere.

About the Body Fat Calculator

The Eqsy Body Fat Calculator is designed to help you better understand your body composition, not just your weight.

It uses the U.S. Navy body circumference formula, a method developed for large populations where accuracy, simplicity, and consistency are required. This makes it ideal for tracking progress over time using basic measuring tools.

If your goal is fat loss, your body fat percentage can be combined with our Calorie Calculator to estimate daily calorie needs and plan sustainable weight reduction.

How this fits with other Eqsy calculators

Understanding body fat is just one part of managing your health. On Eqsy, you can combine this calculator with:

BMI Calculator – for a quick weight-to-height comparison
BMR Calculator – to estimate your resting calorie needs
Calorie Calculator – to create a realistic daily calorie target
Ideal Weight Calculator – to understand a healthy weight range for your height

Using these tools together helps you make more informed decisions about fat loss, muscle maintenance, and overall wellness.

This tool is for informational purposes only and does not replace professional medical advice.