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Split Bet in Roulette

Last updated: 01.14.2023 by Andrew Shepard
Odds for 0 version 5.4%
Odds for 00 version 5.3%
Payout 1:17
Expected value ($1) -0.8823

Did you know that you can cover two adjacent roulette numbers with a single bet? This is called a split bet. For instance, you can place your wager in a way that half of the chip is on 25 while the other half is on the 26. This is a split bet on 25 and 26. You’d win if either of those numbers came up. Your odds of winning a split bet sit at 5.4% in European roulette, and the payout ratio is 17:1. Let’s take a look at split bets in action, along with some of the ways you can implement them.

Split Bet in Roulette

Testing Split Bets in Roulette

We will now examine the effectiveness of wagering split bets over an extended period of time. For this trial run, we will base the mathematical model on two possible outcomes. We’ll use the 5.4% win rate along with the 94.6% loss rate. We will give 4 imaginary players a starting bankroll of $1,000 each. Player 1 will wager $1 per round, Player 2 will bet $2 per round, and Player 3 will put down $3 per spin. Player 4 will stake $5 on each spin. We will track each player’s progress over 1,000 turns. The reason for using different stake amounts is to demonstrate the dynamics of their bankrolls throughout the session. Here is a graph of how things turned out.

Split Bet in Roulette test

One of the first things that we notice is that Player 4’s bankroll experienced the most pronounced bankroll fluctuations. This isn’t surprising. If you check out simulations on this site, you’ll notice a similar pattern for larger bets. It only makes sense. In this illustration, Player 1’s bankroll remained quite stable over the 1,000 rounds. In fact, Player 1 was in the black during the first half of the simulation.

Player 2 also spent most of the experiment on the plus side, but he got hot toward the end of the session and ended up with the biggest profit. Player 3 had some early success before tailing off towards the end. A well-timed hot streak over the final 20 or so spins was almost enough to break even. Wagering $5 per spin, Player 4 ended the session with the biggest loss. He was never able to recover from the cold streak he endured midway through the simulation.

So, what does all of this tell us? Well, sticking to split bets throughout an extended session will typically result in a slow and steady decline in bankroll. With that said, using split bets for shorter periods can be profitable. Once again, it comes down to timing.

Tips and Strategies for Split Bets

As it is with straight-up bets, there are a number of ways to use split bets. Let’s discuss some of the options.

Combine Split Bets with Outside Bets

As is the case with straight-up bets, roulette players can combine split bets with outside bets. For example, you could split 10 and 11 while also wagering on red. You could wager, say, $10 on Red and $1 on the 10/11 split. This approach makes the game more dynamic and exciting.

Split Bets with Outside Bets

14 Split Strategy

This strategy is pretty straightforward. In short, we cover 28 numbers with split bets. In other words, we will place 14 wagers each round. This will leave 9 numbers uncovered, including the zero. A win will net us a 4-unit gain, while a loss will cost us a total of 14 units.

As you can imagine, this approach will lose money over the long run simply because the math says so. However, using the 14-split strategy in short bursts can be profitable.

14 Split Strategy

9 Split Strategy

The 9 split strategy is also relatively easy to understand. The principle of the strategy is as follows:

  • To start, we put one base bet on 9 splits. The important thing to remember is that each pair of split numbers is the same color.
  • If we lose, then we increase the bet for each split by one base unit and give it another go.
  • If the winning number falls out, then we return to the amount of the bet in the base unit.

Using the 9 split tactic, we cover 18 of the 37 numbers, which gives us a 48.6% chance of winning. Each of those wins will add 9 units to our bankroll, while each loss costs us 9 units as well. It’s worth mentioning that the 9 split strategy has a lot in common with the d’Alembert system, which we also explained in a separate guide.

9 Split Strategy


The split bet is second only to the straight-up bet in terms of volatility. One of the more interesting aspects of split bets is that they allow for so many unique combinations and patterns. They are also easy to place alongside other types of bets and can be used in a variety of systems.

Being sticklers for detail, we ran a simulation in which players were given $1,000 each to be used only for split bets. The results showed that players who do this will most likely lose a bit of money over the long term, but split bets can yield a profit when used as a short-term betting approach.

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