What is your bust if you were a size 40c bra?

If you wear a size 40C bra, your bust measurement is typically around 40 inches when measured around the fullest part of your bust. The "C" cup size indicates that the difference between your bust measurement and your band size (the 40 inches) is about 3 inches. Therefore, if you were to measure under your bust for the band size and add the cup size difference, it would give you an approximate bust measurement of 40 inches.