Calculate your body fat % using the US Navy formula or BMI method
The US Navy formula uses circumference measurements (waist, neck, and hips for women) to estimate body fat percentage. It's significantly more accurate than BMI-based estimates because it accounts for body shape, not just weight and height.
The BMI method uses the Deurenberg formula to estimate body fat from BMI, age, and sex. It's less accurate for athletes or very muscular individuals, but useful as a quick estimate when tape measurements aren't available.
For best accuracy, also consider DEXA scans (gold standard) or hydrostatic weighing at a health/fitness center.