Size guide: bras Here are tips on how to find the right size when you buy bras for pregnancy and nursing. Find your bra size Measure around the fullest part of your bust. Measure around your body under your breasts (if you don't get an even number, round up). Calculate your cup size by taking the bust measurement minus your under-bust measurement. For example, if you measure 90 cm around the bust, and 73 under your bust: 90 - 73 = 17 = cup size C. In this case your bra size would be 90C. Cup size The difference between the measurement across the fullest part of your bust (A) and the under-bust measurement (B) gives your cup size: A - cup: 12-14 cm difference B - cup: 14-16 cm difference C - cup: 16-18 cm difference D - cup: 18-20 cm difference E - cup: 20-22 cm difference F - cup: 22-24 cm difference G - cup: 24-26 cm difference BRA SIZE GUIDE CHART Band size EUR 65 70 75 80 85 90 95 100 105 US/UK 30 32 34 36 38 40 42 44 46 FR/ES/BE 80 85 90 95 100 105 110 115 120 Cup size AA S S S A S S S M M L L B S S M M L L L XL C S S M M L L L XL XL D M M M L L XL XL XL E/DD M M L L XL XL XL F/DDD M L L XL XL XL G/DDDD L L XL XL XL