We would have to know what you are converting. Cups is a measure of volume. Pounds is a measure of weight and mass. You can not directly convert the two. It could be one to a 100 if it is lead vs. feathers.
1 lb would equal 2 cups of mortar. I think you are looking to make small batches of mortar not to set up fast on you.
According to muellerspasta.com, 3/4 cup dry equals 1 cup cooked.
It depends on the material, 2 pounds of flour will be different in the amount of cups than 2 pounds of butter will be.
There are approximately 4.5 cups of baking soda in 2 pounds.
That is 2 cups.
4 cups of sugar is approximately 2 pounds.
2 cups
31/2 cups
1 1/2 cups
about 6 cups
2 pounds of water is 4 cups
It would be roughly 2 cups per pound. You would probably get 9 cups from a 5 pound bag. Cups is a measure of volume. Pounds is a measure of weight and mass. You can not directly convert the two.