Roulette Bets Explained: Inside, Outside and Speciality Bets
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Understanding Your Chances: Tackling Roulette Odds

July 30, 2024

Roulette has got to be one of the most famous and classic casino games.

It is a favourite with casino patrons on a global scale. Every enthusiast who visits one of the top of the range online casinos must have an understanding about the odds – this is a necessity to initiate a higher level of play.

When you have read this guide, you will know how these odds work.

Outside Bets

Red, black, even, odd, or numbers 1-18 and 19-36 effectively divide the table in half for betting purposes. As the odds of winning these bets are close to 50% in both European and American roulette, the payout is also equal to 1.

Why Isn't Red or Black Exactly 50/50?

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Looking at the roulette table, it might seem that a bet on red or black should offer an equal 50% chance of winning.

The green zero is what changes the calculation.

A European wheel contains 18 red numbers, 18 black numbers and one green zero. That means red covers 18 of 37 possible outcomes rather than half of them.

American Roulette goes one step further by adding a second green 00 pocket. These seemingly small additions are fundamental to the mathematics of roulette and create the casino’s house edge.

The first, second, or third dozen are less likely to happen (1-12, 13-24, and 25-36). The payout for a dozen bets in European roulette is 2 to 1 and 32.43% in American roulette. This rule also applies to wagers placed in columns. 

Inside Bets

Roulette Bets Explained: Inside, Outside and Speciality Bets

A straight is a bet on a single number. They are the least likely outcome and pay 35 to 1.

Bets on two numbers together are called ‘splits’. Those win at odds of 17 to 1.

A stake is any wager that pools three adjacent numbers together: 4,5,6 is a stake. The payoff on this bet is 11-1.

A corner bet covers the numbers 8, 9, 11 and 12 at 8-1 odds and is sometimes called a square bet or a quarter.

Bet across six numbers for a 5-1 payout on the Six Line.

Roulette Probabilities

Many people who enjoy gambling at casinos or on the Internet either don’t know how roulette probability works or don’t care. How someone decides to play is entirely up to them of course, however, playing without this knowledge is almost guaranteed to affect your long-term results.

Let’s start with the double-zero American roulette probability. The wheel is numbered from one to 36 plus zero and zero zero. Let’s say you decide to bet on the number 17, widely considered to be both the favourite of James Bond and the most bet upon in the game.

With 38 possible outcomes, betting on 17 means putting money on just one of those outcomes. The odds of getting a 17 are 1 in 38. If you landed on this number, your payout would be 1 in 36. This is a callback to the casino’s house edge.

Top Tips

  • You can’t lower the house edge or change the odds in roulette but knowing about the odds and probability of winning is vital. 
  • There is no guaranteed strategy for victory, but there are ways players can give themselves a better shot.
  • Be prepared for every game – research payout percentages before playing. 
  • Be smart with game selection –  European roulette has the lowest house edge. 
  • Opt for outside bets for better winning chances and higher payout rates,
  • Try a low-risk strategy – place two equal outside bets like black and odd. 
  • Have fun without risking much money.

It is absolutely mandatory for any roulette player wanting to improve his/her game to master the odds of roulette. From understanding the odds of straight-up to even-money bets and setting their own desired probabilities based on their risk appetites, they can craft a play that balances the thrill of high risk bets with the load security of more risk-averse laid ones.

Roulette Odds

Whether the game of roulette, always a game of chance, is played by spinning the wheel or by knowing the odds, it is up to the player to make an informed decision.

European vs American Roulette Odds

The version of roulette being played has a significant impact on the probabilities.

A European Roulette wheel contains 37 pockets: numbers 1 to 36 plus a single green zero. American Roulette adds a second green pocket, 00, bringing the total to 38.

Consider a straight-up bet on 17.

On a European wheel, there is one winning pocket among 37 possibilities, giving a probability of approximately 2.70%. On an American wheel, the same wager has one winning pocket among 38, reducing the probability to approximately 2.63%.

The difference becomes particularly noticeable when looking at the house edge. Standard European Roulette has a house edge of approximately 2.70%, while standard American Roulette has a house edge of approximately 5.26%.

Even-money wagers aren’t quite 50/50 either. European Roulette has 18 red, 18 black and one green pocket. A bet on red therefore has an 18/37, or approximately 48.65%, probability of winning.

In American Roulette, the additional 00 reduces this further to 18/38, or approximately 47.37%.

That’s why understanding the green pockets is such an important part of understanding roulette odds.

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Conclusion

Understanding roulette odds makes it much easier to see how different wagers compare.

Inside bets cover smaller sections of the wheel and generally offer larger payouts, while outside bets cover more possible outcomes in exchange for lower payouts. Players can therefore choose bets according to the type of experience and level of variance they prefer.

The version of roulette matters too. European Roulette’s single-zero wheel provides a lower standard house edge than the double-zero American version.

What understanding probability can’t do is predict the next winning number. Every spin remains independent, and no betting pattern can guarantee where the ball will land.

Rather than looking at roulette odds as a way to find certain winners, they’re best used to understand the level of risk attached to each available wager and how the game’s payouts are calculated.

FAQs

What are the odds of winning a straight-up roulette bet?

A straight-up wager covers one number. The probability is 1/37, approximately 2.70%, in European Roulette and 1/38, approximately 2.63%, in American Roulette.

Is red or black a 50/50 roulette bet?

Not quite. The green zero means neither colour covers half of all possible outcomes. Red or black has an approximately 48.65% chance in European Roulette and 47.37% in American Roulette.

Which roulette bets are most likely to win?

Even-money outside bets such as red or black, odd or even and 1-18 or 19-36 cover 18 numbers and therefore have some of the highest probabilities of winning on an individual spin.

Why does a single-number bet pay 35:1?

Straight-up bets have a low probability of winning, so they offer one of roulette’s largest standard payouts. The 35:1 payout is slightly below the fair mathematical odds, creating the house edge.

Does European Roulette have better odds than American Roulette?

Yes. Standard European Roulette has a house edge of approximately 2.70%, compared with approximately 5.26% for standard American Roulette.

Can knowing roulette odds help predict winning numbers?

No. Understanding probability helps players compare wagers and risk, but it cannot predict the outcome of an independent roulette spin.
Written By
David Lynch

Experienced writer and editor based in Ireland. Attends poker events, covers all casino games and slots, but is really a keen blackjack and roulette player at heart. A sports fanatic among all other things with a soft spot for soccer and F1