#SaveThisPost // To calculate your bra size, you'll need to take two measurements: your band size (underbust measurement) and your cup size (bust measurement) To measure your band size, wrap a measuring tape snugly around your ribcage, just below your bust. Make sure the tape measure is level all the way around your body, and take note of the measurement in inches. To measure your cup size, wrap the tape measure around the fullest part of your bust, making sure it's level all the way around. Tak