United Kingdom Size 30A to US: 30D

United Kingdom Size 30A: Corresponds to a ribcage band of 76.2 $\text{cm}$ (30 $\text{in}$), bust volume cup size 30A, and recommended sister size 32AA.

US: 30D: Corresponds to a ribcage band of 76.2 $\text{cm}$ (30 $\text{in}$), bust volume cup size 30D, and recommended sister size 32C.