A roulette split bet covers two neighboring numbers on the layout and pays 17 to 1 if either number wins. On a European wheel, the chance is 2 out of 37, or 5.41%. On an American wheel, it is 2 out of 38, or 5.26%. The bet hits more often than a straight-up bet, but the house edge remains the same on standard wheels.
Quick Facts
- A split bet covers exactly two numbers.
- Standard payout is 17 to 1.
- European probability: 2/37 = 5.41%.
- American probability: 2/38 = 5.26%.
- True odds are 35 to 2 on European roulette and 36 to 2 on American roulette.
- It is an inside bet, so chip placement must touch the line between both numbers.
- The bet has higher hit frequency than a straight-up bet but lower payout.
Plain Talk
A split bet is a two-number roulette bet. You place your chip on the line between two adjacent numbers on the betting layout. If either number wins, the dealer pays the bet at 17 to 1.
The important word is layout. Split bets are based on numbers that touch each other on the table layout, not numbers that sit next to each other on the physical wheel. Number 17 and 20 touch vertically on the layout, so they can form a split. Number 17 and 34 may be close on some wheel sections, but that does not make them a normal split bet on the felt.
This page is about the split bet only. For the full menu of inside and outside wagers, read roulette bets explained. For probabilities across all standard bets, use the roulette odds page or the roulette odds calculator.
How It Works
A split bet wins when one of two selected numbers appears.
| Wheel | Total pockets | Numbers covered | Probability | Payout |
|---|---|---|---|---|
| European roulette | 37 | 2 | 5.41% | 17 to 1 |
| American roulette | 38 | 2 | 5.26% | 17 to 1 |
| French roulette | 37 | 2 | 5.41% | 17 to 1 |
The payout is listed as “17 to 1,” which means 17 units of profit for every 1 unit bet. Your winning stake is also returned after settlement. This “to 1” language matters. A 1-unit winning split produces 17 units profit plus the 1-unit original stake back.
Standard roulette payouts are summarized by the Wizard of Odds roulette basics. Regulated live rules, including table wagers and settlement procedure, are published in documents such as the Nevada roulette rules of play and the Massachusetts roulette rules.
Common split placements
| Split example | Layout position | What wins |
|---|---|---|
| 8/11 | Vertical line | 8 or 11 |
| 14/15 | Horizontal line | 14 or 15 |
| 0/3 | Zero edge on a single-zero layout | 0 or 3 |
| 00/3 | Double-zero area on some American layouts | 00 or 3, if offered by layout |
Not every zero-area split looks identical across layouts. American double-zero layouts can vary in the top section. The dealer and table signage control what is accepted.
Roulette Table Example
A player has 100 units and bets 5 units on the split between 14 and 17.
| Result | Settlement | Bankroll after result |
|---|---|---|
| Ball lands on 14 | Win 85 units profit; stake returned | 185 units |
| Ball lands on 17 | Win 85 units profit; stake returned | 185 units |
| Ball lands on any other European pocket | Lose 5 units | 95 units |
The player feels like the bet is “almost a single-number bet with twice the chance.” That is emotionally true. Mathematically, the price is still short of true odds. Two winning numbers out of 37 should pay 35 to 2 in fair odds, which equals 17.5 to 1. The casino pays 17 to 1.
From the Casino Side:
Split bets are where dealers need clean eyes and clean hands. A chip slightly off the line can create a dispute after the spin. The dealer must know whether the chip was meant as a straight-up bet, a split, a street, or an accidental bad placement.
Floor supervisors care about split bets because they are common sources of “I meant the line” arguments. Surveillance cares because a player reaching after “no more bets” can nudge a chip from a losing number into a winning split position. The casino does not need to fear the math of the split bet. It needs to protect the placement.
On busy roulette games, good dealers repeat unclear bets before the spin or correct bad placement immediately. That prevents a small chip from becoming a large argument.
Common Mistakes
- Placing the chip near the line but not clearly on the line.
- Thinking wheel neighbors are the same as layout neighbors.
- Forgetting that a split bet still loses on zero unless zero is one of the two numbers.
- Calling a split verbally while placing the chip in the wrong position.
- Believing a two-number bet has a better house edge than a one-number bet.
- Confusing 17 to 1 profit with 18 units total return.
- Using splits as part of a progression system and ignoring total action.
Hard Truth
A split bet hits twice as often as a straight-up bet, but roulette does not give you that extra coverage for free. The payout drops, and the house edge stays built into the price.
FAQ
What is a split bet in roulette?
A split bet is a wager on two adjacent numbers on the roulette layout. You place the chip on the line between the two numbers.
How much does a split bet pay?
A standard split bet pays 17 to 1. A 1-unit winning split earns 17 units profit, and the original 1-unit stake is returned.
What are the odds of winning a split bet?
On European roulette, the probability is 2/37, or 5.41%. On American roulette, it is 2/38, or 5.26%.
Is a split bet better than a straight-up bet?
It hits more often, but it pays less. On standard wheels, it has the same house edge as most other roulette bets. Compare it with straight-up bet odds before assuming it is safer.
Can I split zero with another number?
Yes, if the layout offers that exact placement. Zero-section layouts differ between European, French, and American tables, so follow the table design.
Does a split bet reduce the house edge?
No. On a standard European wheel, the house edge is 2.70%. On a standard American wheel, it is 5.26%. Bet shape does not remove the zero.
Why do players like split bets?
They feel like a compromise: more chance than one number, more payout than a street, corner, or outside bet. That feeling is real, but it does not change expected value.
Deeper Insight
Split bets teach one of the most important roulette lessons: coverage changes variance, not the underlying price of the game.
When you cover two numbers instead of one, you will win more often. But the casino adjusts the payout downward from 35 to 1 to 17 to 1. The payout is not random. It is designed so the missing zero value remains with the house.
On a European wheel, a fair two-number bet would work like this: 2 winning outcomes and 35 losing outcomes. True odds against the player are 35 to 2. Divide by 2 and you get 17.5 to 1. A fair casino would pay 17.5 units profit for every 1 unit bet. Real roulette pays 17.
On an American wheel, there are 36 losing outcomes against 2 winning outcomes. True odds are 36 to 2, or 18 to 1. The casino pays only 17 to 1. That is why American roulette is more expensive.
This is the same principle explained in roulette payouts vs true odds and roulette house edge.
Formula / Calculation
Probability of a split bet:
P(split win) = favorable pockets / total pockets
European roulette:
P(split win) = 2 / 37 = 0.054054 = 5.41%
American roulette:
P(split win) = 2 / 38 = 0.052632 = 5.26%
Expected value for a 1-unit European split:
EV = (2/37 × 17) - (35/37 × 1)
EV = 34/37 - 35/37 = -1/37 = -0.027027
House edge:
House Edge = -Player EV / Initial Stake
House Edge = 0.027027 / 1 = 2.70%
Formula Explanation in Plain English
A European split wins 2 times and loses 35 times in a perfect 37-spin cycle. The two wins earn 34 units total profit. The 35 losses cost 35 units. That leaves the player down 1 unit after 37 units wagered. One unit lost out of 37 is 2.70%.
The American version has one extra losing pocket. That extra pocket is why the same-looking split costs more over time.
Related Reading
Use the roulette guide to place split bets in the full course sequence. Then compare split bets with street bet odds, corner bet odds, and the main roulette odds page. For cost, check roulette house edge and test examples with the expected loss calculator. If you are using splits because a number feels “due,” read why roulette systems fail.