Free Body Fat Calculator
Body Fat Calculator
Calculate your body fat percentage using the proven Navy Method
Body Circumference Measurements
Navy method has 90%+ correlation with DEXA scans
How to Use the Body Fat Calculator
Our body fat calculator uses scientifically validated methods to estimate your body fat percentage. The Navy Method is considered one of the most accurate measurement-based approaches, requiring only basic body measurements. For the most accurate results, ensure proper measurement technique and consistency in measurement location. Take measurements at the same time of day, preferably in the morning, for consistent results.
Select your preferred unit system (Metric or Imperial)
Measurement Tips
For accurate results, measure in the morning before eating, use a flexible measuring tape, and take measurements at the same spots each time. Don't pull the tape too tight or too loose.
What the Body Fat Calculator Calculates
The Body Fat Calculator estimates your body fat percentage using anthropometric measurements (body measurements) through scientifically validated formulas. The primary method used is the U.S. Navy Circumference Method, which has been extensively validated and correlates well with DEXA scan results. This calculator provides your estimated body fat percentage, categorizes it according to fitness standards, and offers insights into your body composition. You'll also receive personalized recommendations based on your results, ideal body fat ranges for your age and gender, and comparisons to athlete and fitness standards. The tool helps you understand whether your body fat percentage is in a healthy range and what steps you can take to optimize your body composition for better health and fitness.
Example Calculations
Athletic Male Example
Measurements
Body Fat %
This body fat percentage of 12.5% falls in the athlete category for men, indicating excellent fitness and muscle definition.
Fitness-Focused Female Example
Measurements
Body Fat %
Body fat of 22.1% is in the fitness range for women, showing good muscle tone and healthy body composition.
Average Male Example
Measurements
Body Fat %
Body fat of 19.8% is in the average range for men. There's room for improvement through diet and exercise.
Understanding Your Results
These examples show typical scenarios across different fitness levels. Remember that body fat percentage alone doesn't determine health - muscle mass, cardiovascular fitness, and overall lifestyle are equally important factors.
Frequently Asked Questions
Still have questions about BMI calculations?
Try the CalculatorBody Fat Calculation Formulas & Scientific Background
Understanding the mathematical foundation behind body fat percentage calculations
Formula
Navy Method - Men
Body Fat % = 495 / (1.0324 - 0.19077 × log10(waist - neck) + 0.15456 × log10(height)) - 450
Navy Method - Women
Body Fat % = 495 / (1.29579 - 0.35004 × log10(waist + hip - neck) + 0.22100 × log10(height)) - 450
Scientific Background
The U.S. Navy Circumference Method was developed by the U.S. Navy as a practical way to assess body composition without expensive equipment. It has been validated against hydrostatic weighing and DEXA scans, showing strong correlation (r = 0.90+) with actual body fat measurements. The method is based on the principle that body fat distribution patterns are relatively consistent and can be estimated using key circumference measurements.
Medical Disclaimer
This body fat calculator provides estimates based on circumference measurements and should not replace professional body composition analysis. Results may vary in accuracy for individuals with unusual body fat distribution patterns, athletes with high muscle mass, or those with certain medical conditions. Always consult with healthcare providers for comprehensive health assessments.