How To Calculate Your Casino Game Odds?

4 January 2018 5 minutes to read
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To be a successful gambler, you must understand the odds of the casino game you’re playing. Moreover, its payouts and betting strategy if you want to give yourself a sporting chance at beating the house.

Initially, it seems like a lot to process. Besides, you don’t need to be a mathematician to let the casino’s game odds work in your favor.

CasinoWhizz’s not-too-complicated guide covers the odds of the most popular casino games at online casinos.

Calculating the Odds of Casino Games

Smart gamblers know how to use the odds of casino games to their advantage. With that in mind, players that play to win money can determine the odds of a casino game in two ways:

Fractional Odds

We write them as a fraction of 8/1, 5/2, and so forth. When you place your bets on the second number, the odds that the first number wins are 8/1.

Simply put, if you wagered a dollar you’ll win $8. Should the odds be 5/2 odds and you wagered $4 you’ll win $10. The value of every second number you wagered, the first number wins as well as the stake on your return.


With the help of a simple percentage formula. The fractional odds are probability (%)=B/(A+B), they are the first and second numbers.

If we use the 9/1 example the formula is 1/(10+1)=0.09. In layman’s terms, the probability of it occurring again will be 9%. This type of odds occurs more in sports betting than in casino games.

There are times when we can write the odds as decimals, for example:9.0. Keep in mind, that the odds of each online casino game differ.

Texas Hold’Em

black jack cards

In televised poker. The cards lying on the table display each poker player’s hand as a percentage that outlines their winning chances.

That’s the ”Outs”, they base the percentage on the number of cards that are in the deck. Basically, that helps the player improve his/her odds of winning that hand.

Let’s say the player holds Q♠ and 9♠, and the board cards on the table are J♠ 2♠ 7♦ A♦. To win the hand you can do the following calculation:

Take the number of cards in any suite which is 13. Subtract the number of spades on the table and the ones you’re holding (4): 13 – 4 = 9.

Therefore, the number of outs you’ll have will be 9. To calculate your odds of completing the flush you must do the following:

In Texas Hold’Em there are 52 cards in a deck. The number of cards you have in your hands is 2. There are 4 cards laying on the table, the community cards equal 46 (52-6).

If you subtract 9♠ from 46 it equals 37. The odds of you winning the hand will be 4/1 or 20%. Out of the 46 cards, 9 cards remain for you to complete the flush and score a win.

Strictly speaking, 37 cards remain, and your odds of winning the hand are 39:9 or 4:1 (20%).

Alternative Ways to Calculate Math Casino Games

After the flop, you can calculate the number of outs left in the deck. To determine your winning card on the turn or the river multiply the amount of outs by 4.

Once the dealer shows the turn card multiply the number of outs by 2. There are two roulette variants namely American and European. Each game has its own house edge.

The house edge in American Roulette is 5.26% (2/38). And if you play Europen Roulette it’s 2.70% (1/37). To determine the house edge, divide the total number of slots by the number of zeros on the wheel.

If the house edge is 5.26% (2/38), or 2.70% (1/37). The odds on any even money bet be it on red/black, or odd/even will be 47.37 (18/38). If you’re playing American roulette. On a European wheel, we’re looking at 48.6%.

Your odds of winning the bets on individual numbers are way lower. Assuming you place your bets on black, red, odd, even, 1-18, and 19-36.


Blackjack is one of the few casino games where the odds favor the player. To be good at blackjack you must understand its basic strategy. Your odds on a multi-horse shoe look like this:

If you have a 10 and 2 your chances of busting is 31%. If it’s a 10 and 3 your chances of busting will be 38%. A J and 4 your chances of busting will be 46%.

When you hold a Q and 5 your odds at busting will be 54%. Finally, if you hold a K and 6 it’s 62%. In blackjack when your hand value increases your odds of winning the hand decrease.


In craps, there is a slew of different bets which makes it a difficult game to master. Before you can become a decent craps player, you must know the ‘rolling different combinations of numbers first.

The more you play craps the better you’ll become at it. It’s not impossible to have a load of unbeatable streaks. The hottest streak in the history of the game was at the Las Vegas Desert Inn in 1950.

A player had 27 straight wins or passes. For what it’s worth the odds of gaining this feat is 12,467,890 to 1. Luckily for the casino, the player’s bets were small.

If he bet the house limit on each roll he would have won a mammoth $268 million. If you want to learn more about the game’s rules, our craps guide is the real deal.


A random number generator or RNG governs the outcome of each spin on a slot machine. Novice players believe that there are a number of ”payoff cycles”.

Aside from their interesting and captivating themes, Americans love to play slots to win money. They have one of the highest payback ratios, some slot games have RTPs as high as 98%.

Unfortunately, slot games have a negative player advantage. In the long run, the casino will always win no matter what betting strategy you use.

All the information about the slot game such as its RTP or bonus rounds is in its paytable. When you click on the (?), the data in the paytable or help screen pops up.

The payout percentages of slots can be anything from 90% up to 98%. Progressive jackpot slots have RTPs of 92% because of the life-changing payouts they offer. The tighter the game is the bigger the payout.

If the house edge of a slot is 96% it means that for every $100 you wager, you’ll win $96. In general, the house edge of slots at online casinos is way better than land casino slots.

The RTPs of some of the Vegas slot machines can be as low as 73%. The biggest slots jackpot ever won is $39,710,826.36, the player overcame the odds of 16 million to one.

Conclusion How To Calculate Your Casino Game Odds?

We often hear that the better you become at something the luckier you get. The same principle applies to playing casino games to win money.

To improve your chances of winning, know the game’s basic strategy, its rules, and odds, and know when to quit. Remember, no matter how good you are at playing a casino game, the house always wins.

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