Body Fat Calculator
US Navy method — accurate & free
About the Body Fat Calculator
The ToolsVera body fat calculator estimates your body fat percentage using the well-known US Navy tape method. It is a practical no-equipment alternative to calipers and scale scans for tracking progress during fat loss or recomposition.
How to use the Body Fat Calculator
- Measure with a tape: Measure neck, waist (and hips for women) with a flexible tape.
- Enter your numbers: Type measurements along with height and sex.
- Read your BF%: Your estimated body fat percentage appears instantly.
Why use our Body Fat Calculator?
- Requires only a flexible tape measure.
- Good progress indicator when measured consistently.
- Free, private and fast.
- Includes useful healthy-range context.
Frequently Asked Questions
Is this Body Fat Calculator really free?
Yes. Body Fat Calculator on ToolsVera is 100% free to use with no signup, no hidden limits and no watermark added to your output.
How accurate is the Navy method?
It is typically within a few percentage points of DEXA for most adults — very usable for tracking trends.
Should I measure before or after eating?
Measure in the morning before eating for the most consistent week-to-week results.
Does it work for athletes and bodybuilders?
Very lean or very muscular individuals can fall outside typical ranges; combine with other methods for accuracy.
Is my data safe?
Yes. Files are processed on the server and automatically deleted — we never store your content.