Casino Roulette Strategies

Odds of winning slots

How to Play Slots for Real Money  June 24, 2016 – 05:38 pm
Playing according to a sensible slot strategy is essential in order to do well at casino games.
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How Real-Money Slots Work - The Basics

When you press Spin, the RNG generates a random number (between one and a billion, for example) for each reel of the machine. Every number represents one of the symbols (the more numbers represent a symbol, the more it is "weighted" in the machine).

The EPROM chip then determines whether you've won with the combination of symbols or not; the more winning combinations there are, and the more the player wins per winning combination, the higher the odds of winning and the payback of the machine.

Suggesting you have all the information available, calculating your chances of winning at slots is simple: multiply the probability of each outcome with what those outcomes pay, and then sum the results. It's always under 100% (otherwise casinos would make no profit) and often near 90% (casinos make a lot of money from slots).

Here's an example of an imaginary slot machine (let's call it King of Cats) with three winning combinations - a real-life slot machine works the same way but likely with more ways of winning at slots:

Combination Pays Probability Return
Three Lions 2500 0.001% 0.025
Three Tigers 1000 0.015% 0.15
Three Jaguars 400 0.05% 0.2
Three Leopards 50 0.5% 0.25
Three Cheetahs 7% 0.35
Total 3955 7.566% 0.975

The slot machine above would return 97.5% to players in the long run. However, we rarely know the odds of slot machines. We do know the paytable - how much each winning combination pays to players - but we have no idea of the probability of getting that winning combination.

To calculate the probability of a winning combination, we need to know is how many stops there are for each symbol. For example, in the machine above there could be 45 stops and one of them would be a Lion symbol. By calculating (1/45)*(1/45)*(1/45) we get 0.001%, or the probability of hitting three Lion symbols in a row.


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