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Calculators · Health & pregnancy

Body fat calculator

Estimate your body fat percentage using the U.S. Navy circumference method, and see where it falls against the standard categories.

Runs in your browser No signup Free forever Metric · Imperial units
Gender
Units

Enter your measurements, then calculate — your body fat percentage and category will appear here.

0 %
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Essential Athletes Fitness Average Obese
Body fat categories
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How it works

Three steps, no account

1

Pick gender and units

The Navy method uses a different formula for men and women, since women need a hip measurement too.

2

Enter your measurements

Height, neck, and waist for everyone; hip circumference is added for the female formula.

3

Read the category

Your estimated body fat percentage and where it falls against the standard essential/athletic/fitness/average/obese bands.

FAQ

Common questions

How accurate is the Navy method?
It's a circumference-based estimate, generally within a few percentage points of more precise methods like DEXA scans or hydrostatic weighing for most people — accurate enough for tracking your own trend over time, not a clinical measurement.
Why does the formula ask for a neck measurement?
The Navy method estimates body fat from the difference between waist (and hip, for women) and neck circumference — neck size correlates with frame size and is used to normalize the waist measurement against it.
Does my measurement data get sent anywhere?
No. The calculation runs entirely in your browser — nothing is transmitted, logged, or stored.
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Body Fat Calculator

Our Body Fat Calculator uses the U.S. Navy Method to provide an accurate estimate of your body fat percentage. This tool helps you assess your fitness level and track changes in body composition over time.

How to Use the Body Fat Calculator

1. Select Your Gender

  • Choose between Male or Female
  • The calculator adjusts measurement fields based on your selection

2. Select Your Unit System

  • Choose between Metric or Imperial units
  • The calculator will adjust input fields based on your selection

3. Enter Your Measurements

  • Metric: Enter height, neck, waist, and hip (for females) circumferences in centimeters
  • Imperial: Enter height, neck, waist, and hip (for females) circumferences in inches

4. Calculate Your Body Fat Percentage

  • Click the "Calculate" button
  • Your body fat percentage and category will be displayed instantly

Body Fat Categories

For Men

  • Essential Fat: 2-5%
  • Athletes: 6-13%
  • Fitness: 14-17%
  • Average: 18-24%
  • Obese: 25%+

For Women

  • Essential Fat: 10-13%
  • Athletes: 14-20%
  • Fitness: 21-24%
  • Average: 25-31%
  • Obese: 32%+

Use Cases

1. Personal Fitness Tracking

  • Monitor changes in body composition
  • Set fitness and health goals
  • Track progress in weight loss or muscle gain programs

2. Healthcare and Fitness

  • Assess patient body composition
  • Provide personalized health advice
  • Integrate into fitness apps and programs

3. Educational Purposes

  • Teach students about body composition
  • Demonstrate the impact of fitness on health
  • Use in health and fitness courses

Technical Features

  • Dynamic Input Fields: Adjusts based on selected gender and unit system
  • Real-Time Calculation: Instant results upon input
  • Responsive Design: Works on mobile, tablet, and desktop devices
  • Body Fat Categories Reference: Easy-to-read table for quick assessment
  • No Data Storage: All calculations performed locally in your browser

Why Use Our Body Fat Calculator

1. Accurate and Reliable

  • Uses the U.S. Navy Method for precise results
  • Provides results with one decimal point

2. User-Friendly Interface

  • Simple and intuitive design
  • Clear instructions and labels
  • Instant feedback with color-coded categories

3. Privacy Focused

  • No personal data collection
  • Works offline after initial page load
  • Safe and secure for all users

Understanding Body Fat Percentage

What is Body Fat Percentage?

Body fat percentage is the proportion of fat in your body compared to your total body weight. It is an important indicator of fitness and health.

How is Body Fat Percentage Calculated?

The U.S. Navy Method uses measurements of height, neck, waist, and hips (for females) to estimate body fat percentage. This method is widely used for its accuracy and simplicity.

Limitations of Body Fat Calculations

While the U.S. Navy Method provides a good estimate, it may not account for all individual differences in body composition. It should be used alongside other assessments for a comprehensive health evaluation.

Remember: Always consult with a healthcare professional for personalized health advice and before making significant changes to your diet or exercise routine.