Of course, these are just estimates. The actual number of Skittles in a jar may be more or less than what is stated above. As we mentioned earlier, there are about 25 Skittles in an ounce. This means that a jar that holds 32 ounces, or about one liter, will have around 800 Skittles. A larger jar that holds 64 ounces is likely to have closer to 1600 Skittles. The best way to estimate the number of Skittles in a jar is to first determine the size of the jar. Once you know how many ounces or liters the jar holds, you can get a somewhat idea as to how many are inside. If you are trying to figure it out, it can be a bit difficult because the jars come in different sizes. The truth is, the number of Skittles in a jar can range anywhere from 500 to 3000.