Body Fat Calculator (Navy Method)
Fill in the values and the answer updates as you type.
How the Body Fat Calculator (Navy Method) works
The US Navy formula uses the logarithm of your height and of your waist minus neck (plus hip for women), all in cm. Measure the waist at the navel for men and at the narrowest point for women, and keep the tape snug but not tight. Accuracy is about ±3–4 percentage points, so use it to track trends. Example: with the default male values, body fat comes to 16.9%.
Inputs and results
The Body Fat Calculator (Navy Method) takes 6 inputs and gives 3 results.
What you enter
- Sex — starts at Male. Choose from: Male and Female.
- Height (cm) — starts at 175.
- Neck circumference (cm) — starts at 38.
- Waist circumference (cm) — starts at 85.
- Hip circumference (women only) (cm) — starts at 95.
- Body weight (kg) — starts at 75.
What you get
- Body fat
- Fat mass (kg)
- Lean mass (kg)
Example: Body Fat Calculator (Navy Method) with the starting values
With sex Male, height 175 cm, neck circumference 38 cm, waist circumference 85 cm and hip circumference (women only) 95 cm, the calculator returns:
| Body fat | 16.94% |
|---|---|
| Fat mass (kg) | 12.7 |
| Lean mass (kg) | 62.3 |
Change any value above and the results update straight away.
Body Fat Calculator (Navy Method) FAQ
How do I use the Body Fat Calculator (Navy Method)?
Enter sex, height, neck circumference and waist circumference in the fields, then read body fat, fat mass (kg) and lean mass (kg) in the result panel. The answer updates as you type, and you can press Calculate or Enter to refresh it. Use “Copy link” to share your exact numbers with someone else.
What does the Body Fat Calculator (Navy Method) calculate?
Estimate body fat percentage from tape measurements. It returns body fat, fat mass (kg) and lean mass (kg) from the 6 values you provide.
What values does the Body Fat Calculator (Navy Method) start with?
It opens with sex Male, height 175 cm, neck circumference 38 cm and waist circumference 85 cm so you can see a working result straight away. Replace them with your own numbers, or press Reset to return to these starting values.
Is the Body Fat Calculator (Navy Method) free and private?
Yes. It is free, needs no account, and runs in your browser, so nothing you type is sent to or stored on our servers. See the Privacy Policy for details.
Can I rely on the Body Fat Calculator (Navy Method) for medical or health decisions?
Treat the result as a well-rounded estimate. Real situations often have details a general calculator cannot know, so confirm medical or health decisions with a qualified professional. See the Disclaimer for more.