Facts checked Article
Casino terminology
What slot has 99% RTP?: definition, and the term it is confused with
99% RTP names a game designed to return 99% of what is staked as prizes over a very large number of plays. It is not a session figure and it is not a compensated game. The Gambling Commission's pages read on 21 September 2026 name no such slot, and this entry names none.
What slot has 99% RTP?
What slot has 99% RTP? No page read for this entry names one; the term is the useful part.
99% RTP means a game designed so that 99% of the money staked on it is given back as prizes over a very large number of plays. The remaining 1% is the house edge.
The Gambling Commission's page on gaming machines was read on 21 September 2026.
It puts the general term this way: '%RTP can be thought of as part of the money paid to play the machine that is then given back to the player as prizes.' A £10 stake at 99% RTP has an expected return of £9.90; the £0.10 is the edge.
This entry names no game. The figure that applies to a game is the one in that game's own information, read on the day.
Not to be confused with: a session return. The same Commission page states that with an 85% machine 'you should not expect to win an average of 85 pence for every £1 you stake during a playing session'. RTP is measured, the page says, 'over 10,000 or 100,000 games for compensated machines and more games than this for random machines'.
Sources checked 21 September 2026.
Sources: Return to player: how much gaming machines payout.
The term, as the Commission's pages state it on 21 September 2026
- Return to player
- '%RTP can be thought of as part of the money paid to play the machine that is then given back to the player as prizes'Return to player: how much gaming machines payout · as checked on
- Measured over
- '10,000 or 100,000 games for compensated machines and more games than this for random machines'Return to player: how much gaming machines payout · as checked on
- Not a session figure
- 'you should not expect to win an average of 85 pence for every £1 you stake during a playing session' (85% machine)Return to player: how much gaming machines payout · as checked on
- Compensated game
- 'Games or virtual events that adjust the likelihood of winning outcomes occurring based on previous payouts or intake'Remote gambling and software technical standards: definition of terms · as checked on
Can casinos adjust the RTP on slot machines?
Two different things are confused in this question. A compensated game is one that, in the Commission's definition of terms, adjusts 'the likelihood of winning outcomes occurring based on previous payouts or intake'; that is adjustment during play.
A designed RTP is fixed before release, and the Commission's testing strategy requires that 'all new products have been adequately tested by an approved test house prior to release'. Whether an operator may choose between designed settings for the same online slot is not stated on any page read for this entry, and this entry does not say.
Sources: Remote gambling and software technical standards: definition of terms; Testing strategy for compliance with remote gambling and software technical standards: summary.
Which slot has the most RTP?
No page read for this entry ranks games by RTP, and the Commission publishes no such list on the pages read. The figure to compare is the one each game states in its own information. Reel & Story owns the long form on reading that figure.
Can I filter slot games by RTP and house edge on popular gambling platforms?
No page read for this entry documents a filter in any operator's interface, so this entry records none. In operator interfaces the RTP figure usually sits in a game's information panel; where it sits on a given lobby is a Felt & Form or Pocket Casino Lab measurement, not a definition.
How do 'RTP' and 'volatility' differ when discussing slot machines?
RTP is the share of stakes returned as prizes over a very large number of plays; volatility is how far a short run of play can stray from that share. The Commission's page fixes the first: the average is measured over tens of thousands of games.
The second is defined in this site's entry on volatility, variance and game statistics words, which owns the pair. See also: Reel & Story for what a stated session length shows.
The table: the account-message decoder
The account-message decoder proper is the entry on what your casino account messages mean. For this term the decoder is arithmetic: what each RTP figure means for a £10 stake, computed from the Commission's definition. Every row is the same sum: expected return = stake × RTP; edge = stake − expected return.
Sources: Return to player: how much gaming machines payout.
| RTP (%) | Expected return on £10 (£) | House edge on £10 (£) | Working | Evidence |
|---|---|---|---|---|
| 99 | 9.9 | 0.1 | £10 × 0.99 = £9.90; £10 − £9.90 = £0.10 | · Return to player: how much gaming machines payout |
| 96 | 9.6 | 0.4 | £10 × 0.96 = £9.60; £10 − £9.60 = £0.40 | · Return to player: how much gaming machines payout |
| 94 | 9.4 | 0.6 | £10 × 0.94 = £9.40; £10 − £9.40 = £0.60 | · Return to player: how much gaming machines payout |
| 85 | 8.5 | 1.5 | £10 × 0.85 = £8.50; the Commission's own example percentage | · Return to player: how much gaming machines payout |
A worked example in pounds
A £10 stake at 99% RTP has an expected return of £9.90; at 96% it is £9.60. The difference is £0.30 per £10 staked, and it appears only across a very large number of plays.
In one session a 99% game can return £0 or £30 on the same £10; the Commission's page says the average is not what to expect 'during a playing session'. Support: GamCare, 0808 8020 133.
What this page does not tell you
It names no game and no operator. It does not say whether one operator's copy of a slot carries a different figure from another's; no page read for this entry states it. It does not define volatility beyond one sentence; that pair has its own entry.
Questions answered
Three stored phrasings, answered in a sentence first.
Sources: Return to player: how much gaming machines payout; Remote gambling and software technical standards: definition of terms.
Questions answered
What are frequent misunderstandings between 'slot volatility' and 'RTP' in slot games?
The most frequent is reading RTP as a session figure: the Commission's page says an 85% machine should not be expected to return 85 pence per £1 'during a playing session'. RTP is the long-run share; volatility is the spread of a short run around it.
What is the difference between RTP and house edge in online slots?
They are the two halves of the same stake: RTP is the share designed to be returned as prizes over a very large number of plays, and the house edge is the remainder. At 99% RTP the edge is 1%, £0.10 on a £10 stake.
Where can I find reliable RTP information for popular slot titles?
In the game's own information, read on the day; no page read for this entry publishes a list. The Commission's testing strategy requires new products to be 'adequately tested by an approved test house prior to release', which is the assurance behind the stated figure, not a directory of figures.
Source: Testing strategy for compliance with remote gambling and software technical standards: summary
Sources checked 21 September 2026
Every page below was read over HTTPS on 21 September 2026.
Sources: Return to player: how much gaming machines payout; Remote gambling and software technical standards: definition of terms; Testing strategy for compliance with remote gambling and software technical standards: summary.
Source ledger
Every page read over HTTPS on 21 September 2026; re-check due within 30 days of publication.
| Source | Publisher | Read on | Re-check due | Note |
|---|---|---|---|---|
| Return to player: how much gaming machines payout | Gambling Commission | On the next revisit | ||
| Remote gambling and software technical standards: definition of terms | Gambling Commission | On the next revisit | ||
| Testing strategy for compliance with remote gambling and software technical standards: summary | Gambling Commission | On the next revisit |
Questions answered
What are frequent misunderstandings between 'slot volatility' and 'RTP' in slot games?
The most frequent is reading RTP as a session figure: the Commission's page says an 85% machine should not be expected to return 85 pence per £1 during a playing session. RTP is the long-run share; volatility is the spread of a short run around it.
What is the difference between RTP and house edge in online slots?
They are the two halves of the same stake: RTP is the share designed to be returned as prizes over a very large number of plays, and the house edge is the remainder. At 99% RTP the edge is 1%, £0.10 on a £10 stake.
Where can I find reliable RTP information for popular slot titles?
In the game's own information, read on the day; no page read for this entry publishes a list. The Commission's testing strategy requires new products to be tested by an approved test house before release, which is the assurance behind the stated figure, not a directory of figures.
Reference sources
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Read Return is not the same as profitReturn is not the same as profit
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