Body Fat Calculator

Estimate body fat percentage using the U.S. Navy method from your height and circumference measurements.

Units Sex

Height Neck Waist Hip

How to use the Body Fat Calculator

Choose units and sex.
Enter your height, neck and waist (and hip).
Click Calculate for your body fat estimate.

100% free, no sign-up, and it all runs in your browser — your data never leaves your device.

FAQ

How accurate is the Navy method?

It is a reasonable estimate from tape measurements, but not as precise as a clinical body-composition scan.

Add this tool to your website — free

Paste this where you want the tool to appear. It links back to ToolKraken.

Option 1 — iframe

<iframe src="https://www.toolkraken.com/embed/body-fat-calculator" width="100%" height="520" style="border:1px solid #e5e7eb;border-radius:12px" loading="lazy" title="Body Fat Calculator"></iframe>

Option 2 — script

<script src="https://www.toolkraken.com/embed.js" data-tool="body-fat-calculator"></script>

Body Fat Calculator

How to use the Body Fat Calculator

FAQ

How accurate is the Navy method?

Add this tool to your website — free

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