Use a DEXA scan (dual-energy X-ray absorptiometry)
Use air displacement plethysmography (Bod Pod)
Use hydrostatic (underwater) weighing
Use 3D body scanning with validated body-fat algorithms
Use multi-frequency bioelectrical impedance analysis (BIA) devices
Use skinfold calipers with a standard measurement protocol (e.g., Jackson-Pollock or Durnin-Womersley)
Use circumference-based methods (e.g., waist/neck/height equations) with validated formulas
Use laboratory-grade BIA scales or handheld BIA devices following the manufacturer’s protocol
Use waist-to-height ratio as a screening metric (not a direct body-fat percentage)
For best consistency: measure at the same time of day, similar hydration status, similar clothing, and consistent device settings
Record the method, date, time, and measurement conditions each time you test
If accuracy is critical, choose DEXA or Bod Pod and repeat under similar conditions