Body Fat Calculator
Free online body fat calculator using the Navy Body Fat Formula. Estimate your body fat percentage with neck, waist and hip measurements instantly.
Navy Body Fat Formula
The Navy Body Fat Formula is a non-invasive method to estimate body fat percentage using body circumference measurements. It's widely used in military, athletic, and fitness communities because it's fast, inexpensive, and reasonably accurate for most people. This method uses the relationship between body measurements and body fat distribution.
How It Works
- For Men: Uses height, neck circumference, and waist circumference measurements
- For Women: Uses height, neck circumference, waist circumference, and hip circumference measurements
- Measurements are converted to a logarithmic formula that estimates lean body mass and subtracts from total body weight
Body Fat Categories
- Essential Fat: 2-5% (men), 10-13% (women) - Required for organ and bodily function
- Athletic: 6-13% (men), 14-20% (women) - Typical for competitive athletes
- Fitness: 14-17% (men), 21-24% (women) - Good health and fitness level
- Average: 18-24% (men), 25-31% (women) - Average for healthy adults
- Obese: 25%+ (men), 32%+ (women) - Associated with health risks
Measurement Tips
Take measurements in the morning when body is most relaxed. Use a flexible measuring tape and keep it snug but not tight. Measurements should be taken at the same time and location on your body. For waist, measure at the narrowest point between ribs and hip bones. For neck, measure just below the Adam's apple. For women, measure hips at the widest point of the buttocks.
Understanding Results
Body fat percentage is just one indicator of health. It's possible to have high body fat and be healthy, or low body fat and have other health issues. Consider combining this measurement with other health markers like fitness level, strength, and overall lifestyle. Track changes over time rather than focusing on absolute numbers.