Estimate Body Fat
Get an estimated body fat percentage based on the information entered into the calculator.
Body Fat Calculator
Estimate your body fat percentage using your height, waist, neck, and hip measurements. This calculator uses the U.S. Navy circumference method to provide an easy body composition estimate.
Body Measurements
Enter your measurements for an estimate
BF%
Measure around your waist without pulling the tape tight.
Body Composition
Estimated body fat percentage
%
Body Fat
—%
Enter your measurements
Your estimated body-fat percentage will appear here.
Fat Mass
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Lean Mass
—
Height
—
Weight
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Calculation Method
U.S. Navy circumference method using height, waist, neck, and hip measurements.
FREE ONLINE BODY FAT CALCULATOR — NO SIGN UP REQUIRED
Body Fat Calculator
Estimate Your Body Fat Percentage
Estimate your body fat percentage using your personal measurements. Enter the required information to get a quick body fat estimate and better understand your body composition.
Useful for general fitness tracking, body composition awareness, progress monitoring, and learning more about how body fat percentage differs from body weight or BMI.
100% Free
Instant Results
Easy to Use
Browser Based
Quick Tool Overview
The All Free Tool's Body Fat Calculator provides an estimate of body fat percentage using the information and measurements requested by the calculator.
Body fat percentage represents the proportion of total body weight that consists of fat. It provides a different perspective on body composition than simply looking at body weight or BMI.
The calculator is designed for general fitness and body-composition awareness. Results are estimates and should not be treated as a medical diagnosis or exact measurement of body fat.
About the Body Fat Calculator
What Is Body Fat Percentage?
Body fat percentage is the proportion of a person's total body weight that is made up of fat tissue. It can provide additional information about body composition beyond total body weight alone.
Why Measure Body Fat?
Tracking estimated body fat can be useful for people interested in fitness progress, body-composition changes, and long-term personal measurements.
Body Fat vs. BMI
BMI compares body weight with height, while body fat percentage attempts to estimate how much of that weight is fat. Because they measure different things, body fat percentage and BMI can provide different information.
How the Body Fat Calculator Works
Enter the requested personal information and body measurements. The calculator applies its selected estimation method and displays an estimated body fat percentage.
Why Body Fat Estimates Can Vary
Different estimation methods can produce different results. Hydration, measurement technique, body composition, and individual characteristics can also affect the accuracy of an estimate.
Key Features
Personal Measurements
Enter the required body measurements to generate a personalized estimate.
Percentage Result
View the estimated amount of body fat as a percentage of total body weight.
Body Composition Tracking
Use repeated estimates as one reference when tracking changes in body composition.
Fitness Progress
Use estimated body fat as one measurement when reviewing general fitness progress.
Easy to Use
Enter the required values and calculate an estimate without performing formulas manually.
Instant Results
Get your estimated body fat percentage quickly after entering the required information.
Browser Based
Calculate your estimated body fat directly in your browser without installing software.
General Health Awareness
Use the estimate as a general reference for learning about body composition.
Simple Reference Tool
Get a convenient body fat estimate for personal tracking and fitness-related reference.
How to Use the Body Fat Calculator
Follow these simple steps to estimate your body fat percentage.
Open the Body Fat Calculator
Open the calculator and prepare the personal information and measurements it requires.
Pro Tip: Use recent measurements for a more meaningful personal comparison.
Select Your Units
Select the available measurement units that match the values you plan to enter.
Pro Tip: Make sure every measurement uses the correct unit before calculating.
Enter Your Personal Information
Enter the requested information, such as age or sex, when required by the calculator.
Pro Tip: Enter your information accurately because it can affect the estimated result.
Enter Your Body Measurements
Enter the required measurements carefully using the appropriate input fields.
Pro Tip: Accurate and consistent measurement techniques can make tracking more useful.
Check Your Inputs
Review all entered values and make sure there are no missing or incorrect measurements.
Pro Tip: Double-check units and decimal values before calculating.
Calculate Your Body Fat
Click the calculate button to process your information and generate an estimated body fat percentage.
Pro Tip: Keep your measurements consistent when comparing results over time.
Review Your Result
Review the estimated body fat percentage displayed by the calculator.
Pro Tip: Remember that an estimated percentage is not the same as a direct body-fat measurement.
Record Your Result
If you are tracking body composition, record the estimate together with the date and measurements.
Pro Tip: Consistent conditions can make changes easier to compare over time.
Compare Results Over Time
Repeat the calculation when needed and compare results to observe general changes in your estimated body composition.
Pro Tip: Focus on longer-term trends rather than reacting to small changes between individual measurements.
Use the Estimate Responsibly
Use your result as a general fitness and body-composition reference rather than a medical assessment.
Pro Tip: For health, nutrition, or medical decisions, consider guidance from a qualified healthcare professional.