One-third cup of dried rice yields about 1 cup of cooked rice. Because the rice cooking process follows a 2:1 ratio, most dried rice triples in volume when cooked.
While different types of rice vary somewhat in their proportions and cooking times, generally one cup of dried rice yields between 3 and 4 cups of rice when prepared. Long- and whole-grain varieties tend to yield slightly more than medium- and short-grain rice. Follow instructions on individual packaging when cooking or combine rice, water, salt and butter in a saucepan. Bring to a boil. Reduce heat and cover. Typically for one-third cup of dried rice, two-thirds cup of water is used.