Body Fat Calculator

Estimate body fat % using the US Navy or BMI (Deurenberg) method. Works with metric or imperial units.

Tip: For the Navy method, measure first thing in the morning. For women, hip is required.

Units Switching units updates field placeholders (values are not auto-converted).

Method US Navy uses height + neck + waist (and hip for women). BMI method uses age, sex, BMI.

Sex

Age Required for BMI method. Recommended for context.

Height Enter height in centimeters.

Weight Enter weight in kilograms (for BMI method).

Neck (circumference) Horizontal at narrowest point below Adam’s apple.

Waist (circumference) Horizontal at navel (relaxed abdomen).

Hip (circumference, women) Max circumference over buttocks (women only).

Shortcuts: Press Enter or Ctrl/Cmd + Enter to calculate.

Results

Fill in your details above and click Calculate to see your body fat estimate.

Introduction

If you want to understand your fitness level better, this online body fat calculator is an essential tool. It estimates your body fat percentage using two proven formulas: the US Navy method and the BMI (Deurenberg) equation. You can switch easily between metric and imperial units, making it suitable for users worldwide.

What Is a Body Fat Calculator?

A body fat calculator estimates the percentage of fat in your body compared to your total weight. It’s a more accurate health indicator than BMI alone, as it differentiates between fat and muscle.

How the Online Body Fat Calculator Works

The US Navy Method Explained

This approach uses measurements of the neck, waist, and height (and hip circumference for women). It’s widely used because it provides a reliable estimate without requiring specialized equipment.

The BMI (Deurenberg) Formula

This method uses your BMI, age, and sex to calculate body fat. It’s ideal for general population estimates and quick assessments.

Units: Metric vs Imperial

The calculator allows users to input values in centimeters and kilograms or inches and pounds, providing flexibility and ease of use.

How to Use the Body Fat Calculator

Follow these simple steps to calculate your body fat:

Select your units (metric or imperial).
Choose the method: US Navy or BMI.
Enter your details, including age, sex, height, and weight.
For the Navy method, add neck, waist, and hip (if female) measurements.
Click Calculate to get your results instantly.

Why Body Fat Percentage Matters

Your body fat percentage is a key indicator of overall health. A healthy body fat range helps reduce the risk of conditions like heart disease, diabetes, and high blood pressure. It’s also a useful metric for tracking fitness progress.

Benefits include:

Better understanding of body composition
Improved goal setting for weight management
Enhanced tracking of muscle vs fat changes

Accuracy Tips for Best Results

Measure first thing in the morning before eating.
Use a flexible tape for neck, waist, and hip measurements.
Stand naturally without flexing.

Frequently Asked Questions (FAQ)

Q1: How accurate is the online body fat calculator?

It provides a reliable estimate based on research-backed formulas, though professional measurements like DEXA scans are more precise

Q2: What’s a healthy body fat percentage?

It varies by gender and age. Generally, men aim for 10–20%, and women for 20–30%.

Q3: Which method should I choose—US Navy or BMI?

The US Navy method is slightly more accurate for most users, while BMI-based estimates are quicker and simpler

Q4: Can I use this calculator if I’m an athlete?

Yes, but athletes may get slightly skewed results due to higher muscle mass

Q5: Does it store my personal data?

No, calculations are done instantly in your browser, and no data is saved

Conclusion

The online body fat calculator is a convenient way to monitor your health and fitness progress. Whether you prefer the US Navy or BMI method, it provides quick and reliable insights into your body composition.

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