A cup of rice weighs approximately 7 ounces, according to Traditional Oven's conversion calculator. The exact weight of 1 cup of rice varies depending on the type of grain, whether the rice is cooked, how tightly packed the grains are and whether the measurement is a metric or U.S. cup.
Raw, uncooked basmati rice weighs less than the same volume of uncooked long-grain white rice. Both types of rice weigh less than uncooked short-grain white rice. According to the USA Rice Federation, 1 cup of cooked rice weighs about 8 ounces, which is about 1 ounce more than an equivalent volume of raw rice.
In the United States, 1 cup holds 240 milliliters. Much of the rest of the world use a metric cup for measurement, which holds about 4 percent more, according to Veg World.