Skittles come in several different bag sizes. One pound of Skittles is roughly 440 pieces. Therefore, for every ounce of Skittles in a bag, there should be about 27.5 Skittles.
Some experiments have found that bags do not always contain a consistent amount of Skittles even if they are the same size. The typical retail bag of Skittles found at the checkout counters of grocery and department stores is 2.17 ounces. These bags should contain about 55 Skittles, but actual tests by consumers have found they range from about 54 to 62 per bag. Consumers can expect a similar variation in the other bag sizes.