What is the Breast Size Index (BSI)?
An anthropometric index measuring proportional breast volume relative to torso circumference and total body weight.
Breast Size Index (BSI) — Anthropometric Leaderboard & Spectrum
Proportional torso-normalized volumetric ranking across 760+ documented public figures and adult glamour models.
Scientific Methodology & BSI Formula
Traditional bra cups (A, B, C, D, DD, etc.) are non-standardized marketing labels that fail to measure physical volume or torso torque. The Breast Size Index defines a continuous, objective spectrum:
BSI = ( Breast Mass % / 2 ) + ( Breast Volume [Liters] / Waist:Height Ratio )
By anchoring bilateral breast volume (using 0.95 kg/L human tissue density) to the waist-to-height ratio (WHtR), BSI objectively identifies genuine macromastia, gigantomastia, and anatomical outliers without the distortions of legacy Schnur charts.
Frequently Asked Questions
What are the BSI Tiers?
Petite (<2.0), Standard Proportion (2.0–4.0), Full Bust (4.0–6.5), Heavy Bust (6.5–10.0), Colossal Outlier (10.0–15.0), and Hyper Outlier (>15.0).