The percentage of wagered money that is expected to be paid back to players in the form of winnings. It is seen as a measure of the fairness of a casino game and is often regulated by gaming authorities. In most cases the house edge is the difference between the payout percentage and 100%. For example a game with a payout percentage of 95% has a house edge of 5% which means that the casino will keep an average of 5% of all money wagered.