As a baseline, 2 ounces of dried pasta is half a cup, which will turn into 1 cup cooked. This can vary based on the pasta shape. It can range up to 3/4 cup for larger short-cut pasta. For long strands like spaghetti, when held together in a bundle, the bottom diameter is about 3/4 inch or the size of a dime. Dried pasta about doubles in size when cooked.