For women buying a new bra, it is essential to know the correct size. In fact you should measure your bra size every six months to make sure you are wearing the right size bra. And because different countries have different sizing systems, it is important to make sure you choose the right size, especially if you are ordering online. The bra size calculator gives you your bra size for a number of countries including UK/EUR/FRA/AUS. Bra sizes always contain a number and letter. The number is the measurement immediately below the bust. This should be a firm measurement to ensure adequate support of the breasts. The letter is the cup size, which is obtained by measuring around the fullest part of the bust accurately, but not too tightly. When you have both sets of measurements, enter these in the bra size calculator and discover your correct bra size.