Slots vs roulette odds

Slots vs roulette odds: which costs less?

Measured by house edge, single-zero roulette beats most slots. A European wheel has 37 pockets, numbers 1 to 36 plus a single zero, and pays as if there were 36. That gap gives the house 1/37 of every stake on average, which is 2.70%. A slot’s edge is 100% minus its RTP, and most well-known online slots list between about 94% and 97%, so their edge is roughly 3% to 6%.

But odds are only part of the cost. How fast you play, how much each bet is and whether you choose a high-variance bet or game all shape what a session costs and how it feels. The sections below take each in turn, with pound figures.

Roulette odds: every bet has the same edge

On a single-zero wheel every standard bet has the same 2.70% house edge, however you spread your chips. The payout is always slightly less than true odds would require. A straight-up bet on one number wins 1 time in 37 but pays 35 to 1; true odds would be 36 to 1. Wizard of Odds’ roulette guide (opens in a new tab) sets out the same figures for every bet type.

American wheels add a double zero, giving 38 pockets with the same payouts. The edge rises to 2/38, or 5.26%, and the five-number bet on 0, 00, 1, 2 and 3 is worse at 7.89%. Some single-zero tables in French style return half of an even-money stake when zero lands, which halves the edge on those bets to 1.35%; check the table rules to see if this applies.

Slot odds: why every game is different

A slot doesn’t show its odds on the layout the way a roulette table does. The chance of each result is buried in reel strips and weights run by a random number generator, and the paytable doesn’t tell you how often each line lands. What you can see is the RTP, which UK-licensed games must make available before you play. That single figure tells you the long-run edge.

So a few slots, such as Blood Suckers, have a lower edge than European roulette on paper, and progressive jackpot games such as Mega Moolah are far higher in the base game. Many slots also come in several RTP versions, and the casino chooses which one to run. Our list of high RTP slot machines and the question which slots have the best odds go further.

Speed: the hidden factor in slots vs roulette

Average cost = stake × number of games × house edge. The house edge is only one part; the number of games per hour is the other. Under the Commission’s RTS 14 responsible product design standard (opens in a new tab), online slots must take at least 2.5 seconds per spin (since 31 October 2021) and other online casino games, including RNG roulette, at least 5 seconds per game cycle (since 17 January 2025). Live dealer roulette runs slower still, because a real wheel has to spin and settle.

The pace rows are assumptions, not measured averages, but the lesson is solid: a slow game with a 2.70% edge costs far less per hour than a fast one at 4%. Our slot cost per hour page and the spin speed rule explain the slot side in more detail.

Volatility: you choose it on roulette, the developer chooses it on slots

Roulette lets you set your own risk. Even-money bets win nearly half the time and pay 1 to 1, so a balance moves slowly. A straight-up bet wins 1 time in 37 and pays 35 to 1, so long losing runs are normal. The edge is 2.70% either way. On a slot, the volatility is built in. Starburst is low volatility with a 500× ceiling; Dead or Alive 2 is high volatility with a 111,111× ceiling. You can change your stake, not the shape of the game.

That difference cuts both ways. Roulette can’t pay more than 35 times a single bet on one spin, while slots can pay thousands of times the stake, which is why many players accept a higher edge. The cost of that ceiling is the long run of small or no returns that high-volatility slots produce.

UK rules for slots and roulette compared

The online stake limits apply only to slots. The Gambling Commission’s online slots stake limit guidance (opens in a new tab) sets £5 per spin for players aged 25 and over (from 9 April 2025) and £2 for 18 to 24-year-olds (from 21 May 2025), and states that other casino games such as roulette are not covered. Roulette tables have their own minimum and maximum bets set by the casino. Autoplay is banned on online slots since 31 October 2021 and on all online casino games since 17 January 2025, and both must show your net position and time played.

In betting shops, roulette-style content often runs on Category B2 machines, the terminals once known as FOBTs. Their maximum stake was cut from £100 to £2 on 1 April 2019, with a £500 maximum prize. The Category B2 FOBT rules page and the betting shop machines guide cover that side.

Myths that apply to both slots and roulette

• ‘Red has come up six times, so black is due.’ Each spin of a wheel and each slot spin is independent. This is the gambler’s fallacy.
• ‘Doubling after a loss guarantees a profit.’ Doubling systems don’t change the 2.70% edge; they trade many small wins for occasional very large losses, and table limits stop the sequence.
• ‘A slot that hasn’t paid is loose now.’ Online slots don’t track your losses, and the RNG doesn’t compensate; see loose and tight slot machines.
• ‘Roulette is a skill game.’ Bet choice changes the variance, not the edge. Neither game can be beaten over time.

A £20 budget on slots vs roulette

1. Decide the stake. At £1 a game, £20 covers 20 roulette bets or 20 slot spins; at 20p, 100 slot spins.
2. Work out the average cost: 20 even-money roulette bets at £1 cost 54p on average (£20 × 2.70%); 100 slot spins at 20p on a 96% game cost 80p.
3. Consider the spread: even-money roulette moves £1 at a time, while a high-volatility slot can return nothing for 100 spins or a large win.
4. Set the time: the slot spins can be over in a few minutes online, so plan breaks or use a reality check.
5. Stop at the budget, win or lose. Our bankroll guide explains how to set one.

Slots or roulette: verdict by type of player

If you want the lowest edge and a slow pace, single-zero roulette on even-money bets is the cheaper entertainment per hour. If the chance of a large win matters, slots offer ceilings roulette can’t match, at a higher cost; pick a high-RTP title and a modest stake. If you play both, compare them by cost per hour rather than by edge alone. More matchups are on the compare hub, and the guide to slot machine odds goes deeper on slot maths.

Where to play slots online in the UK

Our partner casinos offer slots alongside table games, but the offers below are slot offers: their free spins can only be used on the selected slot games, not on roulette. Lobbies change, so search for a game by name and check its RTP in the help screen.

All offers are for new customers aged 18+, and terms apply. Coral: bet £10 on slots and get 100 free spins at 10p each on selected games, 48 hours to accept and valid for 7 days, no wagering on winnings. Ladbrokes: play £10 on slots for up to 500 free spins, 50 a day for 10 days at 10p each on selected games, no wagering. PlayOJO: 80 free spins at 10p on Big Bass Bonanza with a first deposit of £10 or more, winnings paid in cash. Coral and Ladbrokes have one operator, so check the terms before joining both. If gambling is causing worry, the National Gambling Helpline is free on 0808 8020 133.

18+. Gambling should be entertainment that costs money, not a way to make it. Decide a budget before you play: plan a slot budget. Free, confidential help: National Gambling Helpline 0808 8020 133.