Body Fat Calculator
Calculate your body fat percentage and understand your body composition for better health
Calculate Your Body Fat
Your Body Fat Results
About Your Body Fat
Complete the form to get your personalized body fat analysis.
Key Features
Discover why our Body Fat Calculator stands out from the rest
Accurate Calculation
Uses the U.S. Navy formula for precise body fat percentage estimation
Multiple Measurements
Considers waist, neck, and hip measurements for comprehensive analysis
Gender Specific
Different calculations for men and women based on physiological differences
Visual Results
See your body fat percentage on a color-coded scale
Mobile Friendly
Works perfectly on all devices from desktop to mobile
Privacy First
Your data never leaves your browser - complete privacy
Body Fat Categories
Understand what your body fat percentage means for your health
10-13% (F)
Essential Fat
The minimum amount of fat necessary for basic physical and physiological health.
14-20% (F)
Athletes
Typical for many male athletes. Female athletes may be slightly higher.
21-24% (F)
Fitness
Ideal for most people who exercise regularly and maintain a healthy lifestyle.
32%+ (F)
Obese
Associated with increased health risks and should be addressed through lifestyle changes.
How to Use This Calculator
Follow these simple steps to calculate your body fat percentage
Select Your Gender
Choose male or female as body fat calculations differ by gender.
Enter Basic Information
Input your age, weight, and height for the baseline calculation.
Measure Circumference
Measure your waist and neck (and hips for women) with a tape measure.
Get Your Results
See your body fat percentage and receive personalized analysis.
Frequently Asked Questions
Find answers to common questions about body fat percentage
Body fat percentage is a more accurate indicator of health than weight or BMI alone. It helps distinguish between fat mass and lean muscle mass. While BMI only considers height and weight, body fat percentage provides insight into body composition. Healthy body fat levels are associated with reduced risk of chronic diseases, better metabolic health, and improved physical performance. However, it's important to remember that extremely low body fat percentages can also be unhealthy.
This calculator uses the U.S. Navy body fat formula, which incorporates height, neck, and waist measurements (and hip measurements for women) to estimate body fat percentage. The formula was developed based on extensive research and provides a reasonably accurate estimate without specialized equipment. For men: %BodyFat = 86.010×log10(waist - neck) - 70.041×log10(height) + 36.76. For women: %BodyFat = 163.205×log10(waist + hip - neck) - 97.684×log10(height) - 78.387.
For most people, measuring body fat every 4-8 weeks is sufficient to track changes. Daily or weekly measurements aren't recommended as natural fluctuations in water weight can mask actual changes in body fat. The best time to measure is in the morning before eating or drinking, after using the bathroom. Consistency in measurement conditions (time of day, hydration status) will provide the most accurate tracking over time. Remember that the goal should be long-term trends rather than short-term fluctuations.
Healthy body fat percentages vary by age and gender. For men aged 20-39, 8-19% is considered healthy; for ages 40-59, 11-21%; and for ages 60-79, 13-24%. For women aged 20-39, 21-32% is healthy; for ages 40-59, 23-33%; and for ages 60-79, 24-35%. These ranges account for the natural increase in body fat that occurs with age. It's important to note that athletes often have lower body fat percentages, while extremely low body fat can disrupt hormonal balance and physiological functions.
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