The Return to Player (RTP) percentage of a given machine, which shows how much of the total amount wagered is given back to players over timeslots games, determines the machine's odds of winning. For example, a slot machine with a 95 percent RTP will eventually pay out $95 for every $100 wagered. It is crucial to understand that RTP is a theoretical number that has been calculated over millions of spins. fluctuation & volatility.