Slot RTP explained simply: return to player is the share of all money staked on a game that it is designed to pay back over millions of spins. A 96% RTP slot returns £96 for every £100 staked in the long run, which means the remaining £4, the house edge, is your average cost of play.
RTP and house edge always add up to 100%: a 96% slot keeps 4% of everything staked over the long run.
Your expected cost is the total amount you stake, not your deposit, multiplied by the house edge.
Many slots exist in several RTP versions, so always check the figure in the game you open.
There is no minimum RTP for online games in Great Britain, but the figure must be shown before you play.
RTP says nothing reliable about one session; short-run results swing far from the average.
RTP plus house edge
Always 100%
Average cost
Total staked × (100% − RTP)
96% RTP in pounds
About £4 lost per £100 staked, on average
UK minimum RTP online
None set
Where to find it
The game’s rules or help screen
Slot RTP explained in plain numbers
RTP stands for return to player. It is a theoretical figure worked out from the game’s maths: every possible outcome, multiplied by its probability and its payout, added together. The result is the average share of stakes the slot pays back if it were played for an enormous number of spins.
The other side of the same number is the house edge. Take the RTP away from 100% and what is left is the casino’s average margin. Wizard of Odds’ slot guide (opens in a new tab) gives NetEnt’s Dead or Alive as an example: an RTP of 96.82% means a house edge of 3.18%. Our page on RTP vs house edge covers why some games quote one figure and some the other.
The word that matters most is ‘theoretical’. The Gambling Commission’s guidance says games of chance should show ‘the average theoretical return to player percentage’. Nothing in that figure promises you a slice of your own stake back.
How to turn a slot’s RTP into a cost in pounds
The formula is short. Expected loss equals the total amount staked multiplied by the house edge, and the house edge is 100% minus the RTP. So 500 spins at £1 on a 96% slot is £500 staked, and 4% of £500 is £20.
Average cost of 100 spins by RTP and stake
RTP (house edge)
10p spins (£10 staked)
50p spins (£50 staked)
£1 spins (£100 staked)
£5 spins (£500 staked)
98% (2%)
20p
£1
£2
£10
97% (3%)
30p
£1.50
£3
£15
96% (4%)
40p
£2
£4
£20
95% (5%)
50p
£2.50
£5
£25
94% (6%)
60p
£3
£6
£30
Read the table across and the point is clear: the stake size drives the cost far more than a percentage point of RTP does. Moving from a 94% game to a 98% game saves £4 per 100 spins at £1. Dropping from £1 spins to 50p spins on the same 96% game saves £2 per 100 spins and halves the risk on every spin. Our cost per hour page compares the same sums across table games.
Why RTP works on turnover, not on your deposit
A common mistake is to read a 96% RTP as ‘deposit £50 and expect £48 back’. Winnings are usually re-staked, so the money you put through a slot, your turnover, can be several times the money you started with. The edge applies to every pound of turnover.
Worked example. You start with £50 and play 20p spins. That buys 250 spins before any winnings are counted. Suppose small wins along the way keep you going until you have made 600 spins: you have staked £120 in total, not £50. At 96% RTP the expected cost of that turnover is 4% of £120, or £4.80. At a 94% version of the same game it would be £7.20.
This is also why the expected value of a session grows with the number of spins, not with the size of your balance. The more spins you make, the more turnover passes through the edge.
Same slot, different RTP: why versions matter
Developers often build one game in several RTP settings and let each casino choose. Wizard of Odds notes that the RTP of a single slot can differ from one jurisdiction to the next, and our checked data shows several titles with published lower versions.
Published RTP versions of selected slots, with the average cost per £100 staked
On Eye of Horus Megaways the lowest listed version costs more than twice as much per £100 staked as the top one, even though the reels, features and maximum win look identical. That is why our reviews say ‘check the game’s help screen’ rather than treating one RTP as universal. The questions why do some slots have different RTPs at different casinos and can casinos change a game’s RTP go into the detail.
How to check a slot’s RTP before you play
Every licensed game in Great Britain has to make its return or likelihood of winning available before you stake. Finding it takes under a minute.
Open the slot, but don’t spin yet.
Tap the information, menu or ‘i’ icon, usually in a corner of the game screen.
Open the rules or help pages and look for ‘return to player’, ‘RTP’ or ‘theoretical return’.
Note whether more than one figure is given, for example a separate figure for a jackpot or a feature mode.
Compare it with the top version listed in our review of that game. If the casino’s figure is lower, it is running a lower setting.
Decide whether the difference matters to you at the stake you plan to play, using the cost table above.
What UK technical standards say about slot returns
Requirement
What it says
What you see
RTS 3A
Rules must be easily available before you commit to gamble
A rules or help page inside the game
RTS 3C
Information to judge your chances: house edge, RTP or probability of winning
An RTP percentage on most slots
RTS 3D
Prizes and payouts, or how they are worked out, available before you play
The paytable
RTS 7
No compensated games; outcomes can’t be adjusted to hit a target return
Each spin is independent of the last
RTS 9
A progressive jackpot’s RTP shown in line with RTS 3C
A jackpot contribution figure in the rules
No page of the technical standards sets a minimum RTP for online games in Great Britain, so don’t assume every slot clears a certain level. Our pages on UK RTP display rules and RTP information rules quote the wording in full.
RTP on jackpot and feature-mode slots
Progressive jackpots take a slice of each stake to feed the prize pot, so the RTP is split in two. Our checked data lists Mega Moolah at 88.12% for the base game, excluding the jackpot contribution, while Mega Moolah 4Tune Reels is listed at 90.3% including a 5.3% jackpot contribution. Both are well below the 96% common in our reviews.
The jackpot share comes back to players only when someone wins the pot. When a progressive has just reset to its seed value, the effective return is lower than when the pot is large. The Commission’s progressive jackpot standard (RTS 9) (opens in a new tab) requires the jackpot rules, the seed and any ceiling to be shown before you play; see progressive jackpot odds for the maths.
Some games change their return with the mode you play. Mega Joker is listed at up to 99%, but only at the top stake using its Supermeter feature. The headline figure is the best case, not the average across every way of playing.
What slot RTP can’t tell you about tonight’s session
RTP is an average over a huge number of spins. Over a few hundred spins, the spread of results is far wider than the expected loss. The standard deviation of a total result grows with the square root of the number of spins, while the expected loss grows in direct proportion, so short sessions swing widely and only very long runs settle near the RTP.
Take 200 spins at 50p on a 96% slot: £100 staked and an expected loss of £4. In practice you might finish £60 down, or ahead, depending on whether a feature lands. How wide that swing is depends on the game’s volatility, covered in our guide to slot volatility.
Wizard of Odds’ house edge table (opens in a new tab) puts the edge on slot machines in general at 2% to 15%, a much wider range than most table games. The figures on online slots in our reviews mostly sit nearer the low end of that range, but the game’s own help screen is the only figure that counts.
Five common misreadings of slot RTP
Slot RTP: misreading against fact
Misreading
What is actually true
‘96% RTP means I get £96 back from my £100.’
It is an average across all players and millions of spins. Your £100 can return anything from nothing to many times the stake.
‘RTP is how often the slot pays.’
How often a game pays is its hit frequency. RTP is how much it pays back in total.
‘A slot that hasn’t paid will catch up to its RTP.’
UK online games can’t compensate for past results. Each spin is independent.
‘Bigger stakes get a better RTP.’
On most slots the RTP is the same at every stake. Where it isn’t, the rules screen says so.
‘A higher RTP slot is always the better choice.’
It costs less on average, but volatility, max win and your budget matter just as much.
The three offers below are slot offers, for new customers aged 18 or over, and terms apply. RTP still applies to free spins, so it helps to know the face value of what you receive.
PlayOJO: first deposit of £10 or more for 80 free spins on Big Bass Bonanza at 10p each, a face value of £8. No wagering, so winnings are paid in cash. New UK customers only (not Northern Ireland); not combinable with other offers and only through the designated offer link. At the 96.71% version our data lists, the average return on £8 of spins is about £7.74, but check the RTP shown in the game.
Coral Casino: deposit and bet £10+ on slots for 100 free spins at 10p each on selected games, a face value of £10. Accept within 48 hours, use within 7 days, no wagering on spin winnings. Offer period 1 October 2026 to 1 February 2027; Neteller, PayPal, Paysafe, Skrill, prepaid cards and certain debit cards are excluded.
Ladbrokes Casino: deposit and spend £10+ on slots for 50 free spins a day over 10 days, up to 500 spins at 10p each (£50 face value) on selected games. Claim by 23:59 each day; each day’s spins last 7 days; no wagering. Deposits by prepaid card, PayPal, Paysafe, Neteller, Skrill or Moneybookers don’t qualify.
Coral and Ladbrokes share an operator, LC International Limited, so holding new accounts at both may not be possible. Our slots hub shows the published RTP for each game we review.
Coral and Ladbrokes are both run by LC International Limited (Entain). If you already hold an account with one Entain brand, you may not be able to open another; check the terms first.
Significant terms: 18+. New UK customers (excluding Northern Ireland). First deposit only. Minimum deposit £10. 80 free spins on Big Bass Bonanza, £0.10 each. No wagering requirements; winnings paid in cash. Cannot be used with any other offer. Only available to players who arrive through the designated offer link. Full T&Cs apply. GamCare.org.uk
Read our PlayOJO reviewLicence: Skill On Net Limited, Gambling Commission account 39326. Offer checked 5 October 2026.
Significant terms: 18+. New players only. Offer runs 01/10/2026 to 01/02/2027. Deposit (certain types excluded) and bet £10+ on slot games to get 100 free spins (selected games, £0.10 each, 48 hrs to accept, valid 7 days). No wagering on free spin winnings. Deposits by Neteller, PayPal, Paysafe, Skrill, prepaid cards and certain debit cards do not qualify. Restrictions and T&Cs apply. GamCare.org.uk
Read our Coral reviewLicence: LC International Limited, Gambling Commission account 54743. Offer checked 5 October 2026.
Time limitClaim daily for 10 days; each batch valid 7 days
Worked valueUp to 500 spins at £0.10 (up to £50 in spins)
Significant terms: 18+. New customers only, from 14/11/25 until further notice. Certain deposit methods excluded. Deposit and spend £10+ on slots for 50 free spins a day during the first 10 days after first deposit and registration (max 500, £0.10 each, selected games, claim before 23:59 each day, valid 7 days). No wagering. Prepaid cards, PayPal, Paysafe, Neteller, Skrill and Moneybookers deposits do not qualify. Restrictions and T&Cs apply. GamCare.org.uk
Read our Ladbrokes reviewLicence: LC International Limited, Gambling Commission account 54743. Offer checked 5 October 2026.
18+. Every casino game has a built-in house edge, so over time you should expect to lose what you stake. Set a budget before you play and stop when it’s gone: safer gambling tools and support. Free, confidential help: National Gambling Helpline 0808 8020 133.
Frequently asked questions
What does 96% RTP mean on a slot?
It means the slot is designed to pay back £96 of every £100 staked across a very large number of spins, keeping £4 as its edge. It does not mean you will get £96 back from your own £100. Any single session can end well above or far below that average, and the 4% applies to every pound you stake, including re-staked winnings. Our page on RTP explained covers the general maths across all casino games.
Is a higher RTP slot better?
A higher RTP slot is cheaper to play on average, but it is not automatically the right choice. A 98% game costs about £2 per £100 staked against £4 on a 96% game, a real saving over many spins. Volatility, the maximum win and your budget still shape what a session feels like. The question is a higher RTP slot better walks through the trade-offs.
What is a good RTP for an online slot?
There is no official benchmark, but many popular slots in our reviews sit around 96%. Starburst is listed at 96.09%, Book of Dead at 96.21% and Big Bass Bonanza at 96.71%, while Blood Suckers stands out at 98%. Jackpot games are often much lower in the base game. Our high RTP slots page lists the games in our data with the highest published returns.
Can a casino change a slot’s RTP?
A casino can choose which RTP version of a game to offer, but the rules stop a game changing its odds while it is available for play. UK technical standards also ban compensated games, so a slot can’t tighten after a big win or loosen after a losing run. If you want to know which version you are playing, check the game’s help screen. The question can casinos change a game’s RTP explains more.
Why does the same slot show different RTPs at different casinos?
Because many developers release one game in several RTP settings and each operator picks one. Bigger Bass Bonanza, for example, has published versions at 96.71%, 95.67% and 94.62%. The reels and features look the same, but the lower version costs more on average: about £5.38 per £100 staked against £3.29. See why some slots have different RTPs at different casinos.
Does a slot’s RTP apply to each session?
No, RTP describes the average over millions of spins, not what happens in one sitting. In a session of a few hundred spins the result is dominated by luck: whether a feature lands, and how big it is. Expected loss grows steadily with the number of spins, but the swing around it grows only with the square root, so long-run results drift towards the RTP. Our law of large numbers page explains why.
Is RTP the same as house edge?
They are two ways of stating the same thing, and they always add up to 100%. A slot with a 96.82% RTP has a house edge of 3.18%. Slots usually quote RTP while table games usually quote house edge, but the maths is identical: the edge is your average cost per pound staked. Our guide to RTP vs house edge compares the two across different games.
Do jackpot slots have a lower RTP?
Often yes, at least for the base game, because part of every stake feeds the jackpot pot. Mega Moolah is listed at 88.12% before the jackpot contribution, and Mega Moolah 4Tune Reels at 90.3% including a 5.3% jackpot share. That jackpot share only comes back to players when someone wins it. Our guide to jackpot slots UK explains how the pots are funded and paid.
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