Body Fat Calculator
Estimate your body fat percentage and understand your body composition. Get insights beyond just weight to track your fitness progress.
Your Measurements
Your Body Fat Analysis
Enter your measurements and click "Calculate Body Fat" to see your body composition analysis
Medical Disclaimer
Results are estimates and should not replace professional medical assessment. Body fat measurements can vary based on hydration, timing, and measurement technique. Consult healthcare professionals for comprehensive body composition analysis.
What Is a Body Fat Calculator?
A body fat calculator estimates how much of your body is made up of fat compared to muscle, bone, and water. Unlike weight alone, body fat percentage gives a clearer picture of health and fitness.
Two people can weigh the same but look and feel very different. Body fat explains why.
Why Body Fat Percentage Matters
Body fat is not bad by default. Your body needs it to function properly. Problems start when the percentage is too high or too low. Knowing your body fat helps you set realistic fitness goals and track progress correctly.
How This Body Fat Calculator Works
This calculator uses body measurements instead of guesswork. By combining height, weight, and key circumference measurements, it estimates how much fat your body carries.
You do not need special equipment. A simple measuring tape is enough.
Formula Used in This Calculator
U.S. Navy Body Fat Formula
For Men:
Body Fat % = 86.010 × log₁₀(Waist − Neck) − 70.041 × log₁₀(Height) + 36.76
For Women:
Body Fat % = 163.205 × log₁₀(Waist + Hip − Neck) − 97.684 × log₁₀(Height) − 78.387
*All measurements are taken in the same unit (cm or inches).
Alternative Method: BMI-Based Estimation
When measurement data is limited, this calculator can use BMI for estimation:
Body Fat % = (1.20 × BMI) + (0.23 × Age) − (10.8 × Gender) − 5.4
*(Gender: Male = 1, Female = 0) This method is less precise but useful when circumference measurements aren't available.
Body Fat Percentage by Category
| Body Fat % | Category | General Meaning |
|---|---|---|
| Below 6% | Very Low | Competition level |
| 6–13% | Athletic | Lean and defined |
| 14–17% | Fit | Healthy fitness level |
| 18–24% | Average | Normal range |
| 25%+ | High | Fat reduction recommended |
Same Weight, Different Body Fat
| Person | Weight | Body Fat % | Appearance |
|---|---|---|---|
| Person A | 70 kg | 14% | Lean and muscular |
| Person B | 70 kg | 26% | Softer appearance |
Who Should Use This Calculator?
- Anyone confused by scale weight
- People tracking fat loss, not just weight loss
- Gym users monitoring progress
- Beginners wanting a realistic health metric
This calculator gives direction, not judgment.
Final Thoughts
Body fat percentage tells a story that weight alone cannot. When you understand that story, your fitness decisions become smarter and more sustainable. This calculator is built to inform, not intimidate.