Slot RTP vs casino payout percentage

Slot RTP vs casino payout percentage at a glance

Both figures are percentages, and both are often called a ‘payout rate’, which is where the confusion starts. The table sets them side by side.

Put simply, RTP is the recipe and casino payout percentage is what came out of the kitchen last month, across the whole menu.

What a slot’s RTP measures

A slot’s RTP is worked out from its maths model: every possible outcome, its probability and its payout. Add up probability × payout across all outcomes and you get the expected return per pound staked. A 96% RTP means £96 back per £100 staked over an extremely large number of spins. Our guide to how slot RTP is calculated walks through a simplified model.

UK rules require this information to be easily available before you play. The Gambling Commission’s RTS 3C asks for the RTP percentage or house edge, with the average theoretical return used for games of chance. In practice, that means it appears in each game’s help or info screen.

Figures vary widely between games at the same site. Blood Suckers publishes 98.00%, Starburst 96.09%, and the jackpot slot Mega Moolah 88.12% including jackpot contributions. Many games also come in several RTP versions, which our page on slot RTP versions explains.

What a casino payout percentage measures

A casino payout percentage is a historical figure: total winnings paid to players divided by total stakes, across a set of games over a set period. Some operators publish monthly reports, often checked by an independent testing agency, either for the whole site or split by game type.

Here is a simple worked example for one month at an imaginary casino:

The site-wide 95.45% is a blend. It tells you how much of the money staked came back to players overall that month. It doesn’t tell you the RTP of any particular slot, and it would shift next month if a large jackpot dropped or players moved to different games. The other side of the same number is the casino’s hold: 100% − 95.45% = 4.55% of stakes kept.

Why the two numbers rarely match

Even if every slot at a casino had a 96% RTP, the casino’s measured payout for slots would almost never land exactly on 96%. Four reasons:

1. Game mix. If players stake more on lower-RTP games, the site figure falls; if they favour high-RTP games, it rises.
2. Variance. A month is a short period for high volatility games. One large win can lift the figure noticeably; a quiet month for features can lower it.
3. Jackpots. Progressive jackpots are paid rarely but in large amounts. A month containing a big drop looks generous; the months before it look tight.
4. Versions. The casino’s chosen RTP versions set the theoretical baseline for each game.

None of this means a casino can steer results. UK rules ban compensated games that adjust odds based on past outcomes, so a low month doesn’t lead to a generous one. The version question is covered in slot RTP versions explained, which goes through how casinos pick a setting.

Why neither figure predicts your session

Both numbers describe very large amounts of play. Your session is tiny by comparison. On a 96% game, 500 spins at 20p is £100 staked with an expected loss of £4, but real results might range from losing the full £100 to finishing well ahead, depending on volatility.

A casino reporting 97% last month doesn’t make your next session more likely to return 97%. The figure came from other people’s play, on other games, in a period that has ended. What the RTP does tell you is the average cost of playing that particular game over time, which is useful for comparing games, not for predicting a night’s result.

Four things ‘payout’ can mean on slot sites

Part of the confusion is that ‘payout’ is used for several unrelated things. When you see it in a headline, check which one is meant:

For high-RTP games, see best payout slots. For withdrawal speed, see fast withdrawal slot sites.

How to use RTP and payout figures sensibly

1. Open the slot and find its info or help screen; note the RTP shown there, which is the live figure at that casino.
2. Compare it with the studio’s published figure; if it is lower, the casino is running a lower version.
3. If you are choosing between two similar games, prefer the higher RTP version for a lower average cost.
4. If a casino publishes payout reports, read them for context, not as a forecast.
5. Ignore any site that ranks casinos by an unexplained ‘payout rate’ with no source or period.

How jackpots distort both numbers

Jackpot games are where RTP and measured payouts drift furthest apart. A progressive jackpot’s RTP includes the share of each stake that feeds the pot, so the everyday return is lower than the headline figure. Mega Moolah’s 88.12% includes jackpot contributions, which means most sessions return less than that while the rare jackpot win pays a large lump.

At casino level, a single big jackpot can push a month’s reported payout well above normal. That is why monthly figures for sites with large jackpot networks can jump around. The different pot types are explained on our jackpot slots page.

Licensed slot sites with clear, no-wagering spin terms

Because no-wagering spins pay winnings as cash, the game’s RTP applies to them directly. At PlayOJO, a first deposit of £10 or more brings new UK customers (Northern Ireland excluded) 80 spins on Big Bass Bonanza, worth 10p each, with any winnings paid as cash; the game’s published RTP is 96.71%. At Coral, depositing and betting £10 on slots unlocks 100 spins at 10p on selected games, which must be accepted within 48 hours and last 7 days, with no wagering on what they win. Look in each game’s help screen for the version running. 18+, new players only, terms apply.

18+. Gambling should be entertainment that costs money, not a way to make it. Set a deposit limit before you play: how to set limits. Free, confidential help: National Gambling Helpline 0808 8020 133.