Body Fat Percentage Calculator
Estimate your body fat percentage using your age, gender, height, weight, waist and neck measurements. Choose your preferred unit system and get your results instantly.
What Is Body Fat Percentage?
Body fat percentage is the amount of your total body weight that comes from fat. Unlike body weight alone, body fat percentage can give you a better idea of how your body weight is distributed between fat and lean tissue.
This calculator provides an estimate using the U.S. Navy body circumference method. Your actual body composition may differ because measurements, hydration, muscle mass and other factors can affect the result.
How to Use the Body Fat Percentage Calculator
- Select your gender.
- Choose Metric or Imperial units.
- Enter your age, height and weight.
- Enter your waist and neck measurements.
- Female users should also enter their hip measurement.
- Click Calculate Body Fat to see your estimate.
How Is Body Fat Percentage Calculated?
The calculator uses body circumference measurements along with height and gender to estimate body fat percentage. The formula is designed to provide a practical estimate without requiring specialized body-composition equipment.
What Does the Result Mean?
Body fat percentage varies naturally based on age, sex, genetics, muscle mass and other individual factors. A single percentage should therefore be viewed as an estimate rather than a diagnosis or medical assessment.
For better tracking, measure yourself under similar conditions each time and focus on changes over time rather than one isolated result.
Frequently Asked Questions
What is a body fat percentage calculator?
A body fat percentage calculator estimates the percentage of your total body weight that is body fat using measurements such as height, waist and neck circumference.
Is this body fat calculator accurate?
It provides an estimate rather than an exact measurement. Results can vary depending on measurement technique, body shape, hydration and other factors.
Why does the calculator ask for my waist and neck?
Waist and neck circumference are used by the circumference method to estimate body composition without specialized equipment.
Why do females need to enter hip measurement?
The formula used for females includes hip circumference in addition to waist, neck and height measurements.
Can I use inches and pounds?
Yes. Select Imperial units to enter your height in feet and inches, weight in pounds, and body measurements in inches.
How often should I calculate my body fat?
If you are tracking changes, using the calculator under similar conditions every few weeks can be more useful than checking the result every day.
Can body fat percentage change even if my weight stays the same?
Yes. Changes in muscle and fat mass can alter your body composition even when your total body weight remains relatively stable.