BodyWHAT uses its own proprietary, neural-network-based technology to estimate your body-fat percentage and other body-composition metrics directly from your photos. These in-house models are combined with established anthropometric methods; the published methods and reference ranges below inform and calibrate those estimates.

BodyWHAT's figures are estimates for general fitness and education — not medical advice or a diagnosis. They draw on established methods and published reference ranges:

• Body-fat percentage categories — American Council on Exercise (ACE)
• Body Mass Index (BMI) categories — World Health Organization (WHO)
• Fat-Free Mass Index (FFMI) — Kouri et al., 1995
• Waist-to-height ratio — Ashwell et al., 2012
• Waist circumference & visceral-fat risk — World Health Organization (WHO), 2008
• A Body Shape Index (ABSI) — Krakauer & Krakauer, 2012
• Resting metabolic rate (Mifflin–St Jeor) — Mifflin–St Jeor, 1990
• Protein intake for muscle (1.6–2.2 g/kg) — Morton et al., 2018

Always consult a qualified healthcare professional before making decisions about your health.