# Body Fat Percentage Calculator

> Estimate body fat percentage using the US Navy tape-measure method.

To estimate body fat percentage, measure your neck, waist and — for women — hips, then enter them with your height. The US Navy circumference method is used, which typically lands within three to four percentage points of a DEXA scan.

**URL:** https://convertto.tech/t/body-fat-calculator
**Category:** Health & Fitness (https://convertto.tech/c/health-tools)
**Privacy:** Runs entirely in the browser; no upload
**Cost:** Free, no sign-up
**Last updated:** 2026-08-01

## Key facts

- **Privacy:** Runs entirely in your browser — nothing is uploaded
- **Cost:** Free, unlimited, no sign-up

## How to use

1. Choose the units.
2. Choose the sex at birth.
3. Set the height.
4. Set the neck circumference.
5. Set the waist circumference.
6. Set the hip circumference.
7. The result appears immediately — copy or download it.

## FAQ

### How accurate is this?

The Navy method is usually within three to four percentage points of a DEXA scan for people of average build. It is less reliable at the extremes — very lean or very heavy — because the equations were fitted to a middle range.

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