This calculator uses the U.S. Navy body fat formula, which is based on circumference measurements. While not as accurate as DEXA scans or hydrostatic weighing, it provides a reasonable estimate (±3-4% accuracy) that correlates well with more precise methods.
Males: Uses neck and waist measurements along with height
Females: Uses neck, waist, and hip measurements along with height
Accuracy: Best when measurements are taken consistently at the same locations
Limitations: May be less accurate for very muscular or very lean individuals