Most dried pasta doubles in volume when cooked. For accuracy, measure pasta by weight rather than by cup. Cooked pasta can be measured by volume. The general rule is one pound of dry pasta or freshly made pasta will serve six as an appetizer or four as a main course. Remember - Shapes may vary in size according to the manufacturer, so use these measurements as generalizations. The easiest way to measure pasta is to use your digital scale. 4 ounces of uncooked pasta (elbow macaroni, shells, rotini, cavatelli, wheels, penne, or ziti) = 1 cup dried pasta = 2 1/2 cups cooked pasta. 4 ounces of uncooked pasta (spaghetti, angel hair, vermicelli, fettuccine or linguine) = a 1-inch diameter bunch of dry pasta = 2 cups cooked pasta.