Calculate your body fat percentage using proven circumference measurement methods. Get detailed body composition analysis and personalized health recommendations.
Most accurate for general population - uses circumference measurements
Measure around the narrowest part of your waist
Measure just below the Adam's apple
Our body fat calculator uses scientifically validated circumference measurement methods to estimate your body composition:
The calculator provides your body fat percentage, category classification, lean body mass, fat mass, and personalized recommendations based on your results.
Body fat percentage represents the proportion of your total body weight that consists of fat tissue. Unlike BMI, which doesn't distinguish between muscle and fat, body fat percentage provides a more accurate assessment of body composition and health status.
Our calculator offers three validated methods for estimating body fat percentage:
The U.S. Navy method is considered one of the most accurate circumference-based formulas. It uses waist, neck, and hip (females only) measurements along with height.
Men: Waist and neck circumference, height
Women: Waist, neck, and hip circumference, height
Accuracy: ±3-4% when measured correctly
Similar to the Navy method but uses slightly different mathematical formulas. Provides comparable accuracy and is widely used in military fitness assessments.
A simplified approach that primarily uses waist-to-height ratio. While less precise than Navy/Army methods, it requires fewer measurements and is easier to perform.
Accurate measurements are crucial for reliable body fat calculations:
Circumference methods typically have an accuracy of ±3-4% when measurements are taken correctly. While not as precise as DEXA scans or hydrostatic weighing, they're much more accessible and provide good estimates for tracking changes over time.
The Navy method is generally recommended as it's been extensively validated and shows good correlation with more advanced measurement techniques. The Army method provides similar accuracy, while the YMCA method is simpler but less precise.
Monthly measurements are sufficient for most people. Body fat changes slowly, so more frequent measurements may not show meaningful changes and can be influenced by factors like hydration and time of day.
Circumference methods work reasonably well for athletes, though they may slightly overestimate body fat in very muscular individuals. For the most accurate assessment, athletes might consider DEXA scans or other advanced methods.