Bra Size Guide: Band & Cup Measurements Explained

Bra size combines two measurements:

1. Band Size (Number)

• Measured around ribcage directly under breasts.
• Inches (28-50) or centimeters (70-125).
• Should fit snugly—provides 80-90% of support.

2. Cup Size (Letter)

• Indicates breast volume/projection from chest wall.
• Letters: AA, A, B, C, D, DD/E, DDD/F, etc.
• Each letter = ~1 inch difference between bust and band.

Example

34C = 34-inch band + C cup (3-inch bust-band difference → ~37-inch bust).

Important Notes

• Sizing varies by brand/country (UK vs. US vs. EU).
• Measure professionally or use accurate self-measurement.
• Try multiple styles—fit differs by cut (full-coverage, demi, balconette, etc.).
• Re-measure annually or with weight/hormonal changes.