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Health Calculators

Body Fat Calculator

Verified formula Updated Jun 2026 Private — runs on your device

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Verified formula Private

Body fat

16.4%

For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.

How to use the Body Fat Calculator

The Body Fat Calculator works out your body fat in an instant. Enter gender, height and neck circumference and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.

  1. Enter the gender.
  2. Enter the height.
  3. Enter the neck circumference.
  4. Enter the waist circumference.
  5. Enter the hip circumference (women).
  6. Read off your body fat — the calculator updates automatically, with no button to press.

Worked example

For example, with gender of 1, height of 178 cm, neck circumference of 38 cm and waist circumference of 85 cm and the other inputs, the body fat is 16.4%.

Inputs used
Gender 1
Height 178 cm
Neck circumference 38 cm
Waist circumference 85 cm
Hip circumference (women) 95 cm
Results
Body fat 16.4%

Results are estimates for educational use, not professional advice.

Key terms explained

Circumference
The distance around the edge of a circle, equal to 2 × π × radius.
Body fat
The proportion of your body weight that is fat, as opposed to muscle, bone and water.

Frequently asked questions

It uses the U.S. Navy circumference method, which estimates body fat percentage from your height and tape measurements — neck and waist for men, and neck, waist and hip for women.

Measure in centimetres with a flexible tape, snug but not compressing the skin. Measure the neck below the larynx, the waist at the navel, and the hips at the widest point.

It is a reasonable estimate, typically within about 3–4% of more advanced methods like DEXA. Consistency in how you measure matters more than a single reading.

It varies by age and sex. As a rough guide, fitness ranges are about 14–17% for men and 21–24% for women, while essential fat is lower. Consult a professional for personal advice.

Enter the gender. Enter the height. Enter the neck circumference. Enter the waist circumference. Enter the hip circumference (women). Read off your body fat — the calculator updates automatically, with no button to press.

What Is a Healthy Body Fat Percentage?

For men, a healthy body fat percentage is roughly 10–20%, and for women about 18–28%, with women naturally carrying more essential fat. Athletes are often lower, while levels well above these ranges raise health risks.

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Body Composition: Looking Beyond the Scale

Why the number on the scale tells only part of the story — body fat, lean mass, the FFMI, where fat is stored, and how to measure and track your true body composition.

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Body Fat Table: Body fat by Height

Reference table of body fat for Body Fat across a range of height values — exact, engine-computed figures you can read off at a glance.

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