In order to convert pounds into cups you need to know how many ounces are in each. There are 16 ounces in one pound and there are 8 ounces in one cup so there are 2 cups in one pound. However if you are trying to convert for a cooking recipe, the number of cups in a pound will differ according to what you are measuring. You can find more information here:
. http://www.angelfire.com/bc/incredible/weightmeasure.html