John is right but be wary of Kilo, Mega etc. Computing is the only area (for reasons of binary maths) I know of that they dont mean exactly what they imply. If you bought 1kg of margarine for example, you would be buying 1,000 grams. Same would apply if you were and engineer needing Young's Modulus (years since I went through that stuff and I never ended up an engneer but GigaNewtons per metre squared if memory is right)
It's always seemed funny to me that our normal and seemingly logical maths system (base 10) does not suit binary. Perhaps if we had been created with a different number of digits (fingers and thumbs) our own couting system would have been different.