Health & fitness

Body fat calculator

Estimate your body fat percentage with a tape measure (US Navy method).

Embed this calculator on your website

Copy this code and paste it into your page (WordPress, Wix, Webflow, HTML…). It's free: please keep the link to HOD Calc.

How it works

US Navy formula from height and neck, waist (and hip for women) measurements. An estimate within about ±3–4%.

Results are for guidance only and do not replace professional advice.

Worked example

With the default values:

  • SexMale
  • Height (cm)178
  • Neck (cm)38
  • Waist at navel (cm)84

you get:

  • Estimated body fat15.7 %
  • CategoryFit

Frequently asked questions

How does the “Body fat calculator” tool work?

US Navy formula from height and neck, waist (and hip for women) measurements. An estimate within about ±3–4%.

What do I need to enter?

Just fill in: sex, height, neck, waist at navel, hips. The result updates as you type.

Can you give an example?

Sex: Male; Height (cm): 178; Neck (cm): 38; Waist at navel (cm): 84 → Estimated body fat: 15.7 %; Category: Fit.

Is this calculator free, and is my data private?

Yes. HOD Calc is completely free with no sign-up. The calculation runs in your browser: nothing you type is sent or stored.