It's kinda hard. A-cup is usually the smallest, and then size increases with alphabet letters. (D-cup is bigger than c-cup, for example.) Most women tend to be a c-cup.
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mahatma Gandhian can tell the time without a clock!
That's a lot like asking "How do you convert length to inches ?" The 'litre'IS a unit of volume. When you measure or calculate the size of a volume,you can then use 'litres' to describe it, and to tell others about it.
5.5 inches long is a good size. Did you know the average penis size is about 5.7 inches for 17-year-olds? True girlfriends don't judge you based on your penis size. If you want to amaze a girl with your penis, don't worry about size, worry about what you are doing with it.
Tew Tell Your Size
If you really want to get an answer, ask a better question. I can't even tell what you are asking.