The house edge of a casino game is the measure stating how much money goes to the casino on average. It tells you exactly how confident casinos are that they’ll win every bet of the game over time, and it’s expressed as a percentage indicating how many of all bets maximize their profits. For instance, blackjack has an advantage for the casino of 0.5% on all hands over time. When it comes to online slot casino games the average return is measured through RTP (return to player), which is usually around 92-96%.