The following tables are used in Koopa Kart Wii to determine the probability of receiving an item when an Item Box is opened. Like in Koopa Kart DS, only the tables for the default case are stored in the game's files; in Koopa Kart Wii, it is known as the "Balanced" case. The probability is coded as percentage multiplied by two. The distributions are presented in the order used in the code.
In the races, the item probability distributions are chosen depending on the rank of the driver when the Item Box is opened.