Online Roulette Odds

10th June 2026 By Velvet Bulsink

Online roulette is one of the most iconic and engaging casino games, offering players a blend of chance, excitement, and strategy. Whether you’re a newcomer eager to learn the ropes or an experienced player looking to optimise your bets, understanding online roulette odds is crucial. Knowing how the odds work can help you make informed decisions and enjoy a more rewarding experience at the digital tables.

For UK players, especially those interested in betting without gamstop, grasping the mechanics of roulette odds is essential before diving into real money play. This guide explores everything you need to know about online roulette odds, from the basics to advanced strategies, so you can approach the game with confidence.

What Are Roulette Odds?

Roulette odds refer to the probability of a particular outcome occurring on the roulette wheel. Each bet type comes with its own set of odds, which directly impacts the potential payout. Understanding these odds is key to managing your bankroll and choosing bets that align with your risk tolerance.

The odds in roulette are determined by the number of possible outcomes. For example, A European roulette wheel has 37 pockets (numbers 1-36 and a single zero), while an American wheel has 38 pockets (numbers 1-36, a single zero, and a double zero). The extra pocket in American roulette slightly reduces your chances of winning on any given bet.

Key Differences Between European and American Roulette

Choosing the right roulette variant can significantly affect your odds. Here’s how they differ:

  • European Roulette: 37 pockets (1-36 plus a single zero). House edge is 2.70%.
  • American Roulette: 38 pockets (1-36, single zero, and double zero). House edge is 5.26%.

The additional double zero in American roulette increases the house edge, making European roulette the more favourable option for most players.

How Roulette Odds Work

Roulette offers a variety of betting options, each with its own odds and payout structure. These range from simple even-money bets to complex combinations covering multiple numbers.

Inside Bets

Inside bets are placed on specific numbers or small groups of numbers. They typically offer higher payouts but lower odds of winning.

  • Straight Up: Bet on a single number. Odds of winning (European): 1 in 37 (2.70%). Payout: 35 to 1.
  • Split: Bet on two adjacent numbers. Odds: 2 in 37 (5.41%). Payout: 17 to 1.
  • Street: Bet on a row of three numbers. Odds: 3 in 37 (8.11%). Payout: 11 to 1.
  • Corner (Square): Bet on a block of four numbers. Odds: 4 in 37 (10.81%). Payout: 8 to 1.
  • Six Line (Double Street): Bet on two adjacent rows (six numbers). Odds: 6 in 37 (16.22%). Payout: 5 to 1.

Outside Bets

Outside bets cover larger groups of numbers. They offer lower payouts but higher chances of winning.

  • Red or Black: Bet on the colour of the winning number. Odds: 18 in 37 (48.65%). Payout: 1 to 1.
  • Odd or Even: Bet on whether the number is odd or even. Odds: 18 in 37 (48.65%). Payout: 1 to 1.
  • High or Low: Bet on 1-18 (low) or 19-36 (high). Odds: 18 in 37 (48.65%). Payout: 1 to 1.
  • Dozens: Bet on the first (1-12), second (13-24), or third (25-36) dozen numbers. Odds: 12 in 37 (32.43%). Payout: 2 to 1.
  • Columns: Bet on one of three columns of numbers. Odds: 12 in 37 (32.43%). Payout: 2 to 1.

House Edge Explained

The house edge is the mathematical advantage that the casino holds over the player. In roulette, this edge is built into the game by the presence of the zero (and double zero in American roulette). The house edge ensures that, over time, the casino will make a profit from the bets placed.

For European roulette, the house edge is 2.70%, while for American roulette, it jumps to 5.26%. This means that for every £100 wagered, the expected loss is £2.70 in European roulette and £5.26 in American roulette, on average.

Why the House Edge Matters

The house edge affects your long-term chances of winning. While short-term luck can swing in your favour, the house edge ensures the casino’s profitability over time. Choosing games with a lower house edge, such as European roulette, can help stretch your bankroll and improve your chances of walking away a winner.

Understanding Payouts in Online Roulette

Payouts in roulette are determined by the type of bet you place. The more unlikely the outcome, the higher the payout. However, higher payouts come with lower odds of success.

For example, A straight-up bet pays 35 to 1, but the odds of hitting a single number are just 2.70% in European roulette. Conversely, even-money bets such as red/black or odd/even have nearly a 50% chance of winning, but pay only 1 to 1.

Comparison Table: Odds and Payouts

  • Straight Up: 2.70% odds, 35:1 payout
  • Split: 5.41% odds, 17:1 payout
  • Street: 8.11% odds, 11:1 payout
  • Corner: 10.81% odds, 8:1 payout
  • Six Line: 16.22% odds, 5:1 payout
  • Dozen/Column: 32.43% odds, 2:1 payout
  • Red/Black, Odd/Even, High/Low: 48.65% odds, 1:1 payout

RTP (Return to Player) in Online Roulette

Return to Player (RTP) is another important concept for players. It represents the theoretical percentage of money wagered that will be paid back to players over time.

  • European Roulette RTP: 97.3%
  • American Roulette RTP: 94.74%

The higher the RTP, the better it is for players. This makes European roulette the preferred choice for those seeking better value for their bets.

Special Rules That Affect Roulette Odds

Some online casinos offer special rules that can improve the odds for players, particularly on even-money bets.

La Partage

In French roulette, the “La Partage” rule applies when the ball lands on zero. If you placed an even-money bet, you lose only half your wager, and the other half is returned. This rule effectively halves the house edge on these bets, making them even more attractive.

En Prison

The “En Prison” rule is similar, but instead of losing half, your bet is “imprisoned” for the next spin. If it wins on the next spin, you get your original stake back. Both rules are advantageous for players and can be found at some online casinos.

Strategies and Betting Systems

While roulette is a game of chance, many players use betting systems to manage their wagers. It’s important to remember that no system can alter the fundamental odds, but some can help you structure your play.

Popular Roulette Betting Systems

  • Martingale: Double your bet after every loss, aiming to recover losses with a single win. High risk if you hit a losing streak.
  • Fibonacci: Increase bets following the Fibonacci sequence after losses. Slower progression than Martingale.
  • Labouchere: Create a sequence of numbers and bet the sum of the first and last numbers. Adjust the sequence based on wins and losses.
  • D