Body Fat Percentage Calculator

Body fat percentage is a more accurate measure of health and fitness than BMI because it distinguishes muscle from fat. This calculator uses the US Navy circumference method, which requires only a tape measure and gives results accurate to within 3-4% of DEXA scan measurements.

cm
cm

Measure at the navel level.

cm
cm

Women only - measure at the widest point.

Body fat
23.5 %
Category
Average

How it works

The Navy method uses the circumference of the neck, waist and (for women) hips, along with height, to estimate body fat percentage via a logarithmic formula validated against hydrostatic weighing.

Formula
Men: 86.010 x log10(waist - neck) - 70.041 x log10(height) + 36.76

Frequently asked questions

Where exactly do I measure the waist?

Measure at the navel (belly button) level, keeping the tape horizontal. Breathe normally - don't suck in.

How accurate is the Navy method?

Studies show it is accurate within 3-4 percentage points compared to gold-standard DEXA scans - better than BMI for most people. Very muscular individuals may see slight overestimates.

Related calculators

BMI CalculatorCalculate your Body Mass Index (BMI) in metric or imperial units, see your weight category and the healthy weight range for your height.Calorie (TDEE) CalculatorCalculate your TDEE and daily calorie needs using the Mifflin–St Jeor equation, with targets for maintaining, losing or gaining weight.BMR CalculatorCalculate your BMR, the calories your body burns at rest, using the Mifflin-St Jeor formula. Enter your age, sex, height and weight for an instant result.Calorie CalculatorFind out how many calories you should eat per day to maintain, lose or gain weight, based on your age, sex, height, weight and activity level.

Embed this calculator

Free to use on any site. Please keep the credit link.

<iframe
  id="letmecalc-body-fat-calculator"
  src="https://letmecalc.com/embed/health/body-fat-calculator"
  title="Body Fat Calculator"
  width="100%"
  height="620"
  style="border:0;max-width:100%"
  loading="lazy"
></iframe>
<p><a href="https://letmecalc.com/health/body-fat-calculator" target="_blank" rel="noopener">Body Fat Calculator</a> by letmecalc</p>
<script>
(function () {
  var f = document.getElementById("letmecalc-body-fat-calculator");
  window.addEventListener("message", function (e) {
    if (e.origin !== "https://letmecalc.com") return;
    if (!f || e.source !== f.contentWindow) return;
    var d = e.data;
    if (!d || d.source !== "letmecalc-embed" || d.type !== "resize") return;
    if (typeof d.height === "number" && d.height > 0) {
      f.style.height = d.height + "px";
    }
  });
})();
</script>