Body Fat Calculator

This calculator uses the U.S. Navy Method, a validated technique for estimating body fat percentage using simple body circumference measurements. This method provides results that closely approximate those from more complex laboratory methods, without requiring specialized equipment. It accounts for gender differences in fat distribution patterns.

1. 1

   Take Accurate Measurements

   Measure your neck and waist circumference (and hip circumference for women) using a flexible, non-stretch measuring tape

2. 2

   Enter Your Data

   Input all measurements along with your height, weight, age, and gender into the calculator

3. 3

   Analyze Your Results

   Receive your body fat percentage along with a fitness classification and breakdown of fat mass versus lean mass

• 1

  Take measurements in the morning before eating for the most accurate and consistent results

• 2

  Use a flexible, non-stretch measuring tape and maintain consistent tension each time

• 3

  Take each measurement three times and calculate the average for greater accuracy

• 4

  Track your body fat monthly rather than weekly to observe meaningful changes

• 5

  Focus on your personal improvement rather than comparing yourself to others

• Measuring immediately after exercise when muscles are temporarily enlarged from blood flow

• Pulling the measuring tape too tight or leaving it too loose, affecting accuracy

• Measuring waist at the wrong location - men should measure at navel level, women at the narrowest point

• Expecting rapid changes - body fat percentage changes gradually over weeks and months