CalcVind

Body Fat Calculator

Body fat percentage with a tape measure

Your Measurements

years

Measure the neck below the larynx, the waist at the navel (men) or narrowest point (women), and hips at the widest point.

Body Fat

17.7%Body fat (US Navy)
FitCategory (ACE)
13.3 kg
Fat mass
61.7 kg
Lean mass
20.1%
BMI method estimate
0.49 (healthy)
Waist-to-height ratio
  1. 1
    Measure with a tape
    Neck, waist (and hips for women)
  2. 2
    Add height and weight
    In any unit
  3. 3
    See your body fat
    Percentage, category and masses

The US Navy method

The US Navy formula estimates body fat from body circumferences and height (in cm), usually within 3–4% of lab methods:

Men: 495 ÷ (1.0324 − 0.19077·log₁₀(waist − neck) + 0.15456·log₁₀(height)) − 450

Women: 495 ÷ (1.29579 − 0.35004·log₁₀(waist + hip − neck) + 0.221·log₁₀(height)) − 450

Measuring correctly

Use a soft tape, keep it level and snug without squeezing, and measure in the morning before eating. Take each measurement twice and use the average.

Why body fat beats BMI

BMI only uses height and weight, so a muscular person can be called overweight. Body fat percentage separates fat from muscle, giving a truer picture of health and fitness progress.

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Frequently asked questions

What is a healthy body fat percentage?

Roughly 21–31% for women and 14–24% for men, depending on age and fitness. Athletes are often lower.

How accurate is the Navy method?

Usually within 3–4 percentage points of DEXA scans for most adults. Consistent measuring matters more than the exact number when tracking progress.

Why do women have more body fat?

Women need more essential fat for hormones and reproduction, so healthy ranges are about 8 points higher than men's.

Sources

Last reviewed: October 2026