Measure while wearing your own bra. Please note this will give you an approximate measurement

To measure OVER bust

BAND SIZE: With tape measure around upper bust, high on the back and under the arms, take a snug measurement. That number will be the band size. If it is an odd number, round up to the nearest even number.

CUP SIZE: Measure gently around the body across the high point or fullest point of the bust while wearing a bra. Subtract the band size from the cup measurement just taken. The difference will help you find the right cup.

A difference of:
2” larger indicates B cup
3” larger indicates C cup
4” larger indicates D cup
5” larger indicates E cup
6” larger indicates F cup

FIVE CHECKPOINTS FOR A PROPER BRA FIT

1. Top of cup should completely contain the breast
2. Underwire should clearly surround breast tissue on side and rest on the ribcage
3. Bra band should hug firmly around body
4. Back of bra should stay horizontal across back: if it rides up, band size may be too large
5. Center front should lay flat, down against the breastbone.