Body fat percentage is the total mass of fat divided by total body mass, multiplied by 100. It's an important indicator of your overall health and fitness level.

The Navy Method uses circumference measurements from specific body parts to estimate body fat. It's widely used for its simplicity and reasonable accuracy.

The BMI Method uses your height, weight, age, and gender to estimate body fat. While less accurate than other methods, it provides a quick reference point.

For the most accurate body fat measurements, consider professional methods like DEXA scans, hydrostatic weighing, or air displacement plethysmography.