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Your weight alone does not tell you much. Two people can weigh the same but have totally different health pictures. This body fat calculator helps you find your actual body fat percentage in seconds.
It estimates your body fat percentage using the U.S. Navy method, a formula trusted by fitness professionals and sports scientists worldwide. Enter a few simple measurements and know your number in seconds.
What Is Body Fat Percentage?
Body fat percentage is how much of your total body weight is fat. The rest is lean mass, muscle, bone, water, and organs. Your body carries two types of fat. Essential body fat keeps you alive. It supports hormones, brain function, and organ protection. Storage body fat is the additional fat stored in your body as fuel.
Excess storage fat increases your risk of heart disease, type 2 diabetes, and high blood pressure. Without an adequate level of essential fats, there are hormonal issues and bone loss. Understanding body composition can help you to make better decisions.
How This Body Fat Calculator Works
This calculator uses the U.S. Navy body fat formula, developed at the Naval Health Research Center by Hodgdon and Beckett in 1984. It calculates body fat percentage from your body measurements without any expensive equipment.
Here is the formula it uses:
For Men: BFP = 86.010 x log10(waist – neck) – 70.041 x log10(height) + 36.76
For Women: BFP = 163.205 x log10(waist + hip – neck) – 97.684 x log10(height) – 78.387
The result is an estimate. It is based on population averages. But it is accurate enough to track your progress over time. Pair your result with our BMI Calculator for a fuller health picture.
How to Take Accurate Measurements
Your result is only as good as your measurements. Small errors lead to wrong numbers. Here is how to measure each body part correctly before using this body fat percentage calculator.
Three or four measurements are depending on your gender. Take all of them standing straight and relaxed.
Waist Measurement
Men measure the waist at the belly button level. Women measure at the narrowest part of the waist. Do not suck in your stomach. Keep the tape horizontal and snug but not tight.
Neck Measurement
Place the tape just below your Adam’s apple. Tilt it slightly downward at the front. Do not flare your neck outward. Keep your head straight.
Hip Measurement (Women Only)
Measure at the widest part of your hips and buttocks. Keep the tape parallel to the floor. This measurement is needed only for women in the Navy formula.
Healthy Body Fat Percentage Chart for Men and Women
Once you get your number, you need to know what it means. This table is based on guidelines from the American Council on Exercise (ACE), the same standard used by top fitness professionals.
Category | Men | Women |
Essential Fat | 2–5% | 10–13% |
Athletes | 6–13% | 14–20% |
Fitness | 14–17% | 21–24% |
Acceptable | 18–24% | 25–31% |
Obese | 25%+ | 32%+ |
A healthy body fat range for most men is 8–19%. For most women it is 21–33%. Athletes carry less. Older adults tend to carry more. Do not obsess over one number. Track which category you fall into and whether it moves in the right direction over time.
Use our TDEE Calculator to find your daily calorie needs based on your activity level.
Body Fat Percentage vs BMI
BMI only divides your weight by your height squared. It cannot tell muscle from fat. A muscular athlete and an unfit person can have the same BMI. Body fat percentage is more precise. It shows you exactly how much of your body is fat versus lean mass.
Too much abdominal fat, in particular, has a direct relationship to insulin resistance, high LDL cholesterol and cardiovascular disease. This is why body composition is more important to track than simply weight. Use your Ideal Weight Calculator to create a sensible target.
How to Lower Your Body Fat Percentage
Small habits add up to a significant reduction in body fat, which is much quicker than crash diets. Pay attention to these time-tested solutions.
Increase the amount of lean protein you eat. It helps to maintain muscle mass during fat loss. Reduce foods with artificial ingredients and extra sugar. Include 2-3 sessions of strength training per week. Add in some cardio or HIIT (high-intensity interval training) for quicker fat loss. Get 7 or more hours of sleep. Poor sleep raises cortisol, which increases fat storage. Stay hydrated. Dehydration can also inflate your body fat reading slightly. Use our BMR Calculator to understand your baseline calorie burn and plan from there.
Frequently Asked Questions
What is the accuracy of the U.S. Navy formula for body fat?
It gives a solid estimate for most people. Accuracy comes down to how carefully you measure. Use the same method each time you track.
What body fat percentage is obese for men?
According to ACE, men are obese if their body fat percentage is above 25%. The long-term exposure level is harmful to health.
What is a healthy body fat percentage for women?
For women, the fitness range is from 21% to 24%.. The typical range for athletes is 14%-20%. The acceptable healthy range goes up to 31%.
How often should I check my body fat percentage?
Check every four to six weeks. More often than that just creates confusion. Same time of day and same hydration level give the most accurate comparison.
Is it possible to reduce body fat without a weight loss on the scales?
Yes. Building muscle and burning fat simultaneously can result in no weight loss. But your body composition gets much better.