How much does 1oz of uncoked oatmeal equal cooked?

One ounce of uncooked oatmeal typically yields about 2 to 2.5 ounces of cooked oatmeal, depending on the cooking method and the amount of water or milk used. This means that 1 ounce of uncooked oats generally results in approximately 1/2 to 3/4 cup of cooked oatmeal. Cooking oats causes them to absorb water and expand, increasing their volume significantly.