The deck size of a skateboard depends on the height of the rider. For a person with a height of more than 5'3” with a US shoe size 9 or higher, a full board will work best. And Mini Boards are for kids below 3’5” in height. It will be better if you look for the classic board length between 28 to 32 inches and a width between 7.5 to 8.52 inches.