Body Fat Calculator

Estimate your body fat percentage with the US Navy tape method, using a few simple measurements, and see your fat and lean mass.

Estimate your body fat percentage at home with the US Navy tape method, using just your height, weight and a couple of tape measurements. This body fat calculator shows your fat percentage, your body fat category and how much of your weight is fat versus lean mass, for men and women.

Read the guide: How to Estimate Body Fat at Home

Your measurements

Units
Sex

Estimated body fat

18.8%

Average

Fat mass
15 kg
Lean mass
65 kg

Body fat

18.8%

  • Lean mass81%
  • Fat mass19%

The US Navy tape method is an estimate and can differ from a scan. Informational only, not medical advice.

How it works

  1. 1

    Measure up

    Take your neck and waist (and hip for women) with a tape measure.

  2. 2

    Enter the numbers

    Add your sex, height, weight and the measurements.

  3. 3

    See your estimate

    View your body fat percentage, category, and fat and lean mass.

Instant & 100% private — nothing is uploaded

Every calculation runs locally in your browser. The measurements, dates and details you enter stay on your own device and are never sent to a server — nothing is stored, logged or shared.

Frequently asked questions

How accurate is the tape method?
The US Navy method is reasonably good for tracking change over time, but it is an estimate. A DEXA scan or calipers in trained hands are more precise.
How should I take the measurements?
Measure relaxed, without pulling the tape tight. Waist at the navel, neck below the larynx, hips at the widest point. Consistency matters most for tracking.
What is a healthy body fat percentage?
It varies by sex and age. As a rough guide, many charts put a healthy range around 10 to 20% for men and 18 to 28% for women, with athletes often lower. Use it to track change over time rather than chase one number.

Important

These calculators give general, informational estimates and are not medical advice, diagnosis or treatment. Everyone is different — for decisions about your health, talk to a qualified clinician.

More tools

BMI CalculatorBody mass index, your category and a healthy weight range.Ideal Weight CalculatorA healthy target weight range for your height.Lean Body Mass CalculatorLean (fat-free) mass and fat mass from height and weight.Waist-to-Hip Ratio CalculatorWaist-to-hip ratio and your WHO health-risk band.BMR CalculatorCalories your body burns at rest (Mifflin-St Jeor).TDEE CalculatorTotal daily calories burned, from BMR and activity.

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