Body fat percentage is the proportion of fat to total body weight. This calculator uses the U.S. Navy method based on height and body measurements.
A Body Fat Calculator is a simple tool that helps you know how much fat is in your body. It uses your basic body measurements like gender, age, height, neck, waist, and hips (for women) to give you a close estimate. We use the U.S. Navy Method, which is a trusted and scientific way to calculate your body fat percentage. It shows how much of your body is fat and how much is lean mass like muscles, bones, and organs.
Why Should You Know Your Body Fat Percentage?
This calculator uses your body measurements and applies a special formula made by the U.S. Navy. It takes your height, neck size, waist size — and for women, also hip size — and gives an estimated fat percentage.
For men: It uses height, neck, and waist.
For women: It includes hip measurement too, because women naturally carry more fat around hips.
86.010 × log10(waist − neck) − 70.041 × log10(height) + 36.76
All values should be in centimeters. The log10 part is just a math function that makes the formula work for different body sizes.
163.205 × log10(waist + hip − neck) − 97.684 × log10(height) − 78.387
Again, all measurements in cm. The hip is added in this formula to account for how women's bodies store fat.
These formulas are based on real studies done by the U.S. Navy. They found that body fat can be estimated quite accurately using simple measurements. The math part (logarithm) helps adjust the results for different body shapes and sizes.
Simple way to understand: Bigger waist usually means more fat. Bigger neck means more muscle. And your height balances the numbers.
For the best results, take your measurements carefully:
This calculator gives a close estimate — not 100% exact. For very accurate results, medical tests like DEXA scans are better. Also, things like water levels, bone structure, or muscle mass can affect results. So take this as a helpful guide, not a final answer.
Your body changes with time — workouts, diet, age — everything affects your fat level. Bookmarking this tool helps you check again and again, and track how far you've come. Whether you're losing fat or building muscle, this is a great tool to keep handy.
The Body Fat Calculator is a simple yet powerful tool to understand your body beyond just weight. It gives you real data to work with, helps you make smarter fitness choices, and keeps you motivated on your health journey. Try it now and see the difference for yourself.