A method and apparatus is disclosed for calculating cup and band size for a brassiere comprising the steps of obtaining an under-the-bust measurement indicative of band size and a bust measurement indicative of cup size. If the under-the-bust measurement is even, then the apparatus increases the band size by a first selected amount and decreases the cup size by a second selected amount. The resulting measurements are selectively displayed on a screen according to sizing standards in the U.S. or according to sizing standards in other countries.