There are four cups in 1lb of brown sugar.
That is incorrect. According to Domino Sugar Company, 2⅓ cups of
brown sugar is equivalent to one pound.
Incidentally, for liquids, 1 pint = 1 pound is a good
If you use a liquid measuring cup you will get 8 cups per 4
pounds of granulated sugar or 2 cups per pound. If you use a dry
measuring cup (which you should be using) you will get 10 cups per
4 lbs of sugar or 2.5 cups per pound.