The Science of Probability In Online Casino Betting

The science of probability is the foundation that creates every single betting strategy. Understanding probability is key to understanding how casino games work and how to win at them consistently.

Every game in an online casino has associated odds, which are explanations of the likelihood of you winning or losing at any given time. When you’re playing blackjack against the dealer, for example, you might have an idea in your head of what the odds are based on your cards and the dealer’s up card. But, this is just a feeling or gut instinct rather than the actual odds of the game.

The odds will show win or lose lines associated with each game so that players can understand these probabilities without having to commit to memory every possible situation.

The Science Of Probability In Online Casino Betting

The mathematics of probability is based on dividing the possibilities of something happening by all possible outcomes. What this means in practical terms can be hard to grasp. Thus, we’ll use an example such as using a coin toss.

When we flip a coin, there are two possible outcomes, either it will land on heads or tails. We could equally say that the probability of it landing on heads is 50% or 1/2 (1/2 = .5). This means that if we flip a coin 100 times, the chances are that 50 of these tosses will land on heads.

You can scale this up to all sorts of possibilities for different results depending on how many possible outcomes there are. You can then work out how many of these outcomes you would expect to happen if the probability remains constant.

If each time you toss a coin, there is an 80% chance it will land on heads. What does this mean in practical terms?

This means that if we were to flip the coin 100 times, we would expect that 80 of these times it would land on heads.

Here are some other examples below, along with expected results for each one.

  • 1 dice roll has 6 possible outcomes, 5 of which contain a 6 (5/6 = 3/4). This means if we were to roll this dice 100 times, there is a 75% chance that there would be at least 60 sixes.

  • A card has 4 suits and 13 cards in each suit. This means that the probability of drawing a certain card is 4/52 or 1/13 (1/13 =.0769). If you were to play this game 52 times, all with the same rules every time, the expected result would be that you would draw a King 13 times and any other card 5 times.

These scenarios may seem overly simple, but it is important to note that most forms of probability are not as complex as the examples above. For example, when we look at WB7’s casino games such as blackjack, roulette or even slots, there are countless guides on the internet telling you how to play, what cards or numbers will be drawn next and so on.

All of these guides use the science of probability as their basis, with most giving a very similar picture of what is going to happen in the long run. There are some basic rules that can help you put the probabilities to work for you when it comes to online betting.

Rules and Probabilities

It is important to point out that probabilities by themselves are not enough for success at online casino betting. You need skill, knowledge and of course a lot of luck! The more time you put into learning about probability and how games work, though, the more likely it is that you will come out on top.

The first thing to look at with probability is the house edge. This tells you how much better or worse a game may be for the player compared to being dealt a random hand/roll/card etc. At WB7, an online betting singapore-based site, for example, this number represents your expected loss per bet over time, so the lower, the better.

For example, if you place a $5 chip on Red at roulette and there is an 18% house edge, this means that you can expect to lose $1.18 for each spin of the wheel (average). It is worth noting here that higher house edges are common in online casinos with most games having an edge at or above 10%.

Another situation where knowledge of probability is crucial to success in online casino betting is when it comes to making bets. You may have heard the saying that “the house always wins,” but this could not be further from the truth! The players who are lucky enough to get ahead at playing on online betting singapore-based sites, for example, will generally stay ahead as long as they keep playing.

With this in mind, it is important to note that the more bets you place, the less likely you are to win and the longer you play for, the more money will be taken from your account. Even if we take a low house edge into consideration and only look at short term results (30 spins/rolls etc), it can be seen that placing lots of bets means you will lose more than if you place just a few.


Just as important as the probability is when playing games such as blackjack, roulette and slots is to take into consideration how much money you have available. If we go back to the example of blackjack, if you have $100 available to play with and the minimum bet is $1, this means that each game has a chance of winning up to $99.

If you were to lose more than five games in a row, then it would be advised that you stop playing as your bankroll will not last very long! Thus, being mindful of how much you can afford to lose and when to stop should always be at the top of your strategy.