# Body Fat Calculator

> Estimate body fat percentage using the U.S. Navy circumference method. Tape measure and a few seconds — no scales required.

URL: https://uttir.com/body-fat-calculator
Categories: calculators
Privacy: All measurements stay in your browser.

## About

The U.S. Navy method estimates body fat percentage from a few circumference measurements — height, neck, waist, and (for women) hip. It correlates reasonably well with DEXA scans for most adults and only needs a tape measure.

Enter your measurements in inches, your weight in pounds, and the calculator returns your body fat percentage, the category, the equivalent fat mass, and the equivalent lean mass.

## How to use

1. **Pick your sex** — The formula differs for men and women.
2. **Measure** — Neck (just below the larynx), waist (at the navel for men, narrowest point for women), hip (women, widest point).
3. **Read the result** — See your body fat %, the category, fat mass, and lean mass.

## Examples

### Male, 5'10", 170 lb, neck 15", waist 34"

Typical office worker, light training.

Output:

```
~19% body fat, fitness category
```

### Female, 5'6", 140 lb, neck 13", waist 28", hip 36"

Active adult.

Output:

```
~24% body fat, fitness category
```

## FAQ

### How accurate is the U.S. Navy method?

Within about 3-4% of a DEXA scan for most adults. Less accurate for very lean or very obese individuals, and for people with unusual muscle/fat distribution. Use it for trends over time, not a single measurement.

### Where do I measure each circumference?

Neck: just below the Adam's apple, tape horizontal. Waist: for men, at the navel; for women, at the narrowest point above the belly button and below the ribs. Hip (women only): at the widest point of the buttocks.

### How do body fat categories differ for men and women?

Essential fat is higher for women (10-13% vs 2-5% for men) because of reproductive hormones. Athletes run 6-13% (men) or 14-20% (women). The "fitness" range is 14-17% (men) or 21-24% (women). Average: 18-24% (men), 25-31% (women).

## Related tools

- [BMI Calculator](https://uttir.com/bmi-calculator) — Calculate your Body Mass Index and see where you fall on the healthy range.
- [Calorie Calculator (BMR + TDEE)](https://uttir.com/calorie-calculator) — Calculate your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE). Includes a goal-adjusted daily calorie target.
- [Macro Calculator](https://uttir.com/macro-calculator) — Calculate daily protein, carb, and fat grams from a calorie target. Four common splits: balanced, high-protein, low-carb, and keto.
- [Ideal Weight Calculator](https://uttir.com/ideal-weight-calculator) — Calculate your ideal body weight using four clinical formulas (Devine, Robinson, Miller, Hamwi) plus a healthy BMI range.

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For the full HTML page with the live tool, visit https://uttir.com/body-fat-calculator.
This file is the markdown rendering at https://uttir.com/body-fat-calculator.md. See https://uttir.com/llms.txt for a site-wide summary.