For the determining the best starting point for your bra size, please visit our How to Measure Your Bra Size page.
Wearing your bra, take a snug measurement around your ribcage, directly under your bust and keep level all around. If you get an odd number, round up to the next even number. This is your band size.
Take a loose measurement over the fullest part of your bust, keeping the tape level around your body. If needed, round up to the nearest inch.
Subtract your band size from your bust size, and use the difference to find your cup size on the chart below.