Single Number Roulette: Straight Up Bet Odds, Payout & House Edge

Ever wondered what really happens when you place your chips on just one number in roulette? A straight up bet is one of the most popular and thrilling ways to play, but how does it actually work?

If you’re curious about your chances of winning, what you could get paid, and how much the casino really keeps for itself, you’re in the right place.

Whether you’re new to roulette or an experienced player wanting to refresh the facts, this guide keeps things simple. Let’s take a closer look at how a single number bet works, and what to know before you place your chips on a number you like.

How Does A Straight Up Bet Work In Roulette?

A straight up bet is as simple as it gets. You place a single chip directly on any one number on the roulette layout, including zero (and double zero on American tables). It is called betting straight up because you are backing just one specific outcome rather than a group of numbers.

You can choose any number for any reason and you may back several different numbers at the same time, placing a separate chip on each. Each chip is an independent stake and must comply with the table limits, so your total outlay rises with the number of straight up bets you place.

If the ball lands exactly on your chosen number, you win; if not, you lose that chip. This is an all‑or‑nothing, higher‑variance option. The usual payout is 35:1, and winning chips also have their original stake returned. Outcomes are random and no betting system can change the underlying odds.

This type of bet works the same in both European and American roulette. The payout is the same in each version, but the odds differ because European wheels have 37 pockets (single zero) while American wheels have 38 (zero and double zero), which affects the likelihood of a hit and the house edge.

Roulette should be played for entertainment only. Set a budget, stick to it, and only gamble what you can afford to lose. You must be 18+ to play in the UK.

Single Number Roulette Odds Explained

When you bet on a single number (often called a straight up) in roulette, your chances depend on the version of the game you are playing and the number of pockets on the wheel. Each spin is a separate event, and outcomes are random.

In European roulette, there are 37 pockets on the wheel, from 1 to 36 plus a single zero. Your chance of a straight up hit is 1 in 37, which is about 2.70% for any given spin.

American roulette has 38 pockets, from 1 to 36 plus a single zero and a double zero. Here, your chance is 1 in 38, or roughly 2.63% per spin, making a single number hit slightly less likely than in the European game.

The probability stays the same for every number and for every spin. It is not affected by previous results (such as streaks or recent outcomes) and does not change based on how many chips you place or how you spread your stake.

These figures describe probability only. Roulette has a built-in house edge, so the expected return over time is negative, and you should not expect to profit in the long run. Play for entertainment, set limits, and only stake what you can afford to lose.

Now that the chance is clear, what does a successful hit actually pay?

What Is The Payout For A Straight Up Bet?

A straight up bet in roulette is a wager on a single number. If that number wins, the fixed payout is 35 to 1.

For example, stake £1 on one number and, if it hits, you receive £35 in winnings plus your original £1 stake back, giving a total return of £36. The same ratio applies for larger stakes (e.g., £2 returns £72 in total), subject to the table’s minimum and maximum limits.

This payout is the same on both European and American roulette. It appears large because you are backing only one outcome, but the true odds are longer than the payout reflects: on European wheels the chance is 1 in 37 (true odds 36:1) and on American wheels it is 1 in 38 (true odds 37:1). Paying 35:1 instead of the true odds creates the house edge—around 2.70% on European and about 5.26% on American roulette.

All outcomes are random, and no strategy can change the underlying odds. Only stake what you can afford to lose and consider setting limits to help you play responsibly.

How Does House Edge Differ Between European And American Roulette?

The house edge shows how much the casino expects to keep from all bets over a very large number of spins, and it varies by roulette type.

It is a theoretical long‑term average rather than a prediction of what will happen in any single session, and actual results will fluctuate.

European roulette has a single zero, which gives it a house edge of about 2.7%. Over time, that means the casino keeps roughly £2.70 for every £100 bet, based on standard payouts and rules.

This stems from there being 37 pockets in total and even‑money bets paying 1:1, so the expected value per £1 stake is approximately −£0.027. Short‑term outcomes can be higher or lower than this figure.

American roulette has both a single zero and a double zero. This increases the house edge to around 5.26%, or about £5.26 kept for every £100 bet under typical rules and payouts.

With 38 pockets in play, the expected value per £1 stake is approximately −£0.0526, which is a materially larger average cost than the European wheel.

That extra green pocket makes a noticeable difference to long‑run results. You can see this difference even more clearly by looking at expected value, and by comparing how much a given stake is likely to cost on average over time.

No staking system can remove the built‑in house edge. If you choose to play, consider games with a lower house edge, set limits, and only stake what you can afford to lose. Always check the specific table rules, as variations may affect the theoretical house edge.

Calculating Expected Value For A Single Number Bet

Expected value, or EV, is a way to estimate the long‑run average outcome of a bet if it were repeated many times. It combines the probability of each possible result with the amount won or lost to give an average per wager.

EV is a theoretical average, not a prediction for any single spin. Actual results vary widely from spin to spin because outcomes are random.

Example: Expected Value On A Single-Zero Wheel

Imagine staking £1 on a single number in European roulette. There are 37 pockets, including a single zero, so the probability of a hit is 1/37. A win pays £35 profit, and your £1 stake is returned. The EV is:

(1/37 × £35) + (36/37 × -£1) = -£0.0270

So the average loss is about 2.7p for every £1 bet, which corresponds to a house edge of roughly 2.70%. Over many spins, your results may trend towards this average, but short‑term outcomes can be higher or lower.

Example: Expected Value On A Double-Zero Wheel

Now consider American roulette with 38 pockets, including 0 and 00. The probability of a hit is 1/38, and a win still pays £35 profit plus the £1 stake back. The EV is:

(1/38 × £35) + (37/38 × -£1) = -£0.0526

That works out to an average loss of about 5.3p per £1 bet, reflecting a house edge near 5.26%. The difference versus the single‑zero wheel may seem small per spin, but it increases the expected cost over time.

Gambling is a game of chance and should be viewed as entertainment. Never stake more than you can afford to lose, set limits, and stop if it is no longer enjoyable.

Are Straight Up Bets More Likely To Win Than Other Bets?

Straight up bets are the least likely to win in roulette because they cover just one number. They typically pay 35:1, but the probability of hitting any single number is low. Bets that cover more numbers, such as red or black, even or odd, high or low, or dozens, tend to settle more often, though they pay less (commonly 1:1 for even‑money bets and 2:1 for dozens and columns).

The wheel layout also matters. On a single‑zero (European) wheel, a straight up has a 1 in 37 chance; on a double‑zero (American) wheel it is 1 in 38. Even‑money bets do not win half the time because the zero(s) are not red/black, odd/even, or high/low, which is part of the built‑in house edge.

So there is a trade‑off. A straight up bet offers a higher potential return when it lands, but with a lower probability of success and higher variance. If you prefer more frequent outcomes, outside bets or group bets settle more regularly, though with smaller payouts and slower bankroll swings.

No strategy can remove the house edge, and results are random and independent. Set limits in advance, stake only what you can afford to lose, and avoid chasing losses. Roulette should be played for entertainment rather than as a way to make money.

Practical Bankroll Considerations For Single Number Bets

Single number bets involve long dry spells between wins, so a clear plan helps keep play under control. These outcomes are high variance by nature, and wins can be rare, so prepare for swings and accept that losing runs are normal. Decide in advance how you will respond to those swings, including when to pause and when to stop for the day.

Set a spend limit before you start and stick to it. Only risk money you can afford to lose, and avoid chasing losses by increasing stakes after a setback. Breaking your budget into smaller sessions can make play more manageable and helps you pace yourself. Consider setting time limits as well as money limits, and use safer gambling tools such as deposit limits, time-outs and reality checks where available with licensed operators.

Take regular breaks, and do not play if you are tired, stressed or under the influence of alcohol or drugs. Keep your play social and balanced with other activities so that gambling remains recreational. If it stops being enjoyable, step away.

Results are independent from spin to spin, so short streaks do not signal what will happen next. Keep stakes modest and expectations realistic. With the odds, payout and house edge in mind, you will know exactly what you are getting when you place a single number chip, and you should expect to lose over time even when individual wins occur.

If you are worried about your gambling, support is available from organisations such as GamCare and the National Gambling Helpline, and you can consider self-exclusion tools if you need a break. Gambling is for adults only; please play responsibly.

_{**The information provided in this blog is intended for educational purposes and should not be construed as betting advice or a guarantee of success. Always gamble responsibly.}