You can calculate the house edge of a game based on the RTP (Return to Player) percentage, which is often written next to the games. However, what you lose is won by someone else, and the casino only gets to keep the house edge. In reality, the rest goes back to any of the many thousands of players playing, which is why some end up winning and some end up losing. The casino house edge is a small percentage that is kept of every placed bet, while the rest goes back to the player-hypothetically. Casinos make their money based on the house edge. It is a common misconception that casinos make their money on players’ losses, but that isn’t the case. The answer here is actually surprisingly simple. Still not convinced casinos play fair? Because, after all, how would they make a profit if then? We hear you, and we understand your concerns.