Body Fat Calculator
Estimate your body fat percentage
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⚙️ How It Works
Grab a flexible tape measure. Input your accurate standing height, neck circumference, waist circumference, and (for females) hip circumference. The tool performs the specific logarithmic U.S. Navy equations to estimate your fat composition.
❓ Frequently Asked Questions
How accurate is the U.S. Navy body fat method?
The U.S. Navy method is generally accurate to within 3-4% of your actual body fat percentage for most demographics. It is widely praised for being accessible anywhere since it only requires a simple tape measure.
What is a healthy body fat percentage?
Healthy body fat limits depend heavily on age and gender. Generally, for adult males, 8-19% is considered fit/healthy. For adult females, 21-32% is generally considered the healthy and fit range.
Why do women need to measure their hips?
Due to biological differences in physiological fat distribution, women typically carry more fat around their hips and thighs compared to men (who tend to carry it primarily in the abdomen), making hip circumferences essential for accurate calculations.
Does the Body Fat Calculator work offline?
Yes, the Body Fat Calculator is fully functional offline. Because this tool runs entirely in your browser, no data is ever uploaded to external servers. Once the page is loaded, you can seamlessly continue using it without an active internet connection. You can also install Knicknaks as a Progressive Web App (PWA) for native-like offline access.