Wear a non-padded bra or no bra
Use a soft measuring tape
Measure the underbust snugly around the ribcage, just below the bust
Note the underbust measurement in inches
Measure the bust around the fullest part of the breasts, keeping the tape level
Note the bust measurement in inches
Calculate the difference between bust and underbust measurements
Use the underbust measurement as the band size in Indian sizing
Use the bust difference to determine the cup size
1 inch difference = A cup
2 inches difference = B cup
3 inches difference = C cup
4 inches difference = D cup
5 inches difference = DD/E cup
6 inches difference = F cup
Round the band size to the nearest even number if needed
Check the size using the brand’s Indian size chart
Try on the bra and adjust for fit, comfort, and support