Wrap a soft measuring tape around your back at band level, under each arm and around the front. Measure just below your bust, right about where the bra wire would sit. Keep the measuring tape parallel to the ground. Note your band size.
Your CUP size - at the fullest part of your bust.
Wrap a soft measuring tape around your back at the fullest part of your bust, usually at nipple level. Making sure that the measuring tape is parallel to the ground note your cup size. Use the table below to calculate your bra size based on the combination of your band and cup size.