Is my breast size normal?

Breast size statistics

Breast size varies enormously by country, genetics, BMI, and age. There is no "ideal" size — only statistical averages.

Average cup size by region

• United States: D (average band 34D)
• United Kingdom: D-DD
• Europe: B-C (varies significantly)
• East Asia: A-B
• Global average: B

Key facts

• Average US cup size has increased from B to D since the 1980s (partly due to rising BMI)
• Left breast is slightly larger in 62% of women
• Size fluctuates with hormones, weight, pregnancy, and birth control
• 80% of women wear the wrong bra size (research by Bra Fitting Specialists)

Sources: WorldData.info (2024, global breast size data), Healthline, Journal of Female Health Sciences.