Return to Player (RTP) is an alternative way of displaying a casino’s house edge. Rather than indicate the expected loss amount to the casino, it indicates the expected amount in winnings to be returned to the player. This number is a percentage of their total bets. So in the case of European Roulette, this number is 97.3% (100%-2.7%). For every $100 you wager, your theoretical amount back would be $97.30 considering a $2.70 loss.