Use a body fat scale or smart scale

Use skinfold calipers at multiple body sites

Measure waist, neck, and hips with the U.S. Navy method

Get a DEXA scan for high accuracy

Use hydrostatic weighing

Use air displacement plethysmography

Use bioelectrical impedance analysis

Compare results with body fat charts or online calculators

Track measurements over time for consistency

Use the same method, time of day, and conditions each time