For example, a slot with 3 reels that holds 20 symbols per reel would give you a 7,999 to 1 chance of winning. You could have calculated your odds based on the number of reels and symbols per game. Therefore, it’s hard to quantify the odds of modern slot machines, whereas it was easier to figure out the true odds of an old-school mechanical game.

The player also doesn’t know how the game was designed. But the vast number of possibilities makes the math of slots odds more complex than table games odds. The number of winning combinations and the payouts per combination work together to determine an online slot’s odds. It’s also up to individual game designers to determine how much each winning combination pays. Because of the RNG software, there are thousands, and often millions, of reel combinations. Slots odds work in a similar way to our roulette example, except there are several more possibilities on slots.