Body Fat Calculator – Free US Navy Method Percentage Tool
⚡ Body Fat Analyzer
US Navy Circumference Method
This free body fat calculator uses the US Navy circumference method to estimate your body fat percentage from simple tape measurements. Enter your neck, waist, and (for women) hip measurements for instant results—no signup, no upload, all in your browser.
What Is a Body Fat Calculator?
A body fat calculator estimates the percentage of your body weight that comes from fat rather than lean mass. Unlike BMI, which only compares weight to height, body fat percentage gives a clearer picture of body composition. The US Navy method used here relies on tape measurements of the neck, waist, and hips, making it practical without special equipment.
How to Use This Body Fat Calculator?
Choose Imperial or Metric units at the top, then select your gender. Enter your age, weight, height, neck, and waist measurements. If you are female, also enter your hip circumference. Click "Calculate Body Fat %" to see your estimated percentage, the fitness category it falls into, and a short advice message for that range.
Why Use Our Body Fat Calculator?
Our calculator runs entirely in your browser, so your measurements stay private. It is completely free, requires no account, and works on desktop and mobile. It uses the widely cited US Navy formula, supports both metric and imperial units, and automatically shows the correct fields and defaults based on your gender.
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Frequently Asked Questions
Is this body fat calculator free?
Yes, it is completely free to use with no hidden charges, limits, or premium tiers.
Does it work offline?
Yes, once the page is loaded in your browser, the calculator works without an internet connection.
Is my data safe?
Absolutely. All calculations happen locally in your browser, so your measurements are never sent to any server.
Do I need to create an account?
No account or signup is required. Just open the page, enter your measurements, and calculate.