Body Fat Calculator

By the CalcMundi team · Updated October 22, 2026 · Formulas checked against standard financial math

Measure your neck, waist and, for women, hips. We estimate your body fat percentage.

How to measure

Neck: just below the larynx.
Waist: at the navel, relaxed.
Hips (women): at the widest point.

Ranges

Men: athletes 6–13%, fitness 14–17%, average 18–24%. Women: athletes 14–20%, fitness 21–24%, average 25–31%.

Example

A man 5'9" with a 15" neck and a 34" waist: about 17.9% body fat.

Frequently asked questions

How accurate is it?

Usually within 3 to 4 percentage points. DEXA scans are more precise.

Add this calculator to your website

Free for blogs, real estate agents, brokers and any site. Paste this code where you want the calculator to appear. It adjusts its height on its own.

<iframe src="https://calcmundi.com/embed/body-fat-calculator/" title="Body Fat Calculator" loading="lazy" style="width:100%;max-width:680px;height:640px;border:0"></iframe><script>addEventListener("message",function(e){if(e.origin==="https://calcmundi.com"&&e.data&&e.data.cmH)document.querySelectorAll("iframe[src^='https://calcmundi.com/embed']").forEach(function(f){if(f.contentWindow===e.source)f.style.height=e.data.cmH+"px"})})</script><p style="font:13px sans-serif">Calculator by <a href="https://calcmundi.com/body-fat-calculator/">CalcMundi</a></p>

Results are estimates for information only and are not financial, legal or medical advice. Rates, taxes and fees vary — confirm with a professional or your lender.