Granulated sugar (the regular stuff) weighs about 7.5 ounces per cup, so 2 cups weighs slightly under a pound.
The following table is helpful:
|1 tsp||.15 ounce||4.5 g|
|1 tbsp||.5 ounce||13 g|
|1/4 cup||2 ounces||52 g|
|1/2 cup||3.8 ounces||102 gram|
|1 cup||7.5 ounces||204 gram|
Also, one cup of powdered sugar weighs about 4.3 ounces; and one cup of brown sugar, firmly packed, weighs about 8 ounces.
One cup of granulated sugar can be converted to light brown sugar by adding one tablespoon of unsulfured molasses. Add two tablespoons to convert to dark brown sugar.