What RTP means
RTP is a statistical attribute of an online casino game configuration. An RTP of a game describes its expected return across a very large number of rounds, rather than the amount returned during one spin, one session or one player’s account history.
RTP does not predict a player’s next outcome. A game can produce returns above or below its stated RTP during a short period because the stated figure applies to long-run play across many rounds.
RTP Index operator data
RTP Index recorded 186 licensed operators in its data snapshot dated 8 August 2026. Of those 186 licensed operators, 49 publish RTP information for their game offerings.
The RTP observations published by those operators range from 85.4 to 99.91 in the 8 August 2026 snapshot. The average across all recorded RTP observations is 95.88, which describes the project dataset rather than the expected outcome of a single casino visit.
RTP range for Gates of Olympus
Gates of Olympus is a game observed at 40 casinos in the RTP Index dataset. The recorded RTP range for Gates of Olympus across those 40 casinos is 94.5 to 96.5 as at 8 August 2026.
The Gates of Olympus example shows that one game title can appear with different disclosed RTP values across casinos. A player therefore needs to check the RTP published for the specific game configuration at the operator being considered, rather than treating a game title as having one universal RTP.
High RTP and guaranteed RTP
A high RTP is not guaranteed RTP for a player’s individual session. RTP measures an average over many rounds, so a session can end below or above the published figure without contradicting the game’s long-run configuration.
No online casino game RTP removes the house edge. The house edge is the part of stakes that the game is configured not to return in the long run, and it remains present even where the disclosed RTP is high.
Highest RTP games in the observed data
The highest RTP observation in the RTP Index data snapshot is 99.91, while the lowest observation is 85.4. These figures identify the outer limits of the project’s recorded observations as at 8 August 2026, not a promise that any game will deliver those returns to an individual player.
A request for the highest slot RTP or the best RTP casino game requires a specific operator and game configuration. RTP Index data shows that published RTP can differ between casinos for the same game, as the 94.5 to 96.5 range for Gates of Olympus demonstrates.
What RTP means for the player’s choice
RTP is one factor a player can weigh when comparing online casino games. A higher disclosed RTP indicates a higher long-run return rate for that stated configuration, but it does not identify the outcome of the next round or the result of a single session.
A player should treat operator disclosure as the relevant source for a game’s RTP at that operator. The 49 operators that publish RTP in the RTP Index dataset provide disclosed figures, while the dataset does not establish an RTP value for operators that do not publish one.
What to check on the site
You can check this yourself here: Gates of Olympus; the full RTP table; the list of licensed casinos.
Frequently asked questions
What does RTP mean in online casinos?
RTP means Return to Player. It is the long-run statistical percentage of stakes that a game configuration is expected to return across many rounds, not a guaranteed result for one player or session.
Does a high RTP guarantee a win?
No. A high RTP does not guarantee a win because RTP is a long-run average. Individual sessions can produce results above or below the disclosed RTP, and the house edge remains.
What is the highest RTP in the RTP Index data?
The highest recorded RTP observation is 99.91 in the data snapshot dated 8 August 2026. That observation is a disclosed configuration figure, not a prediction of a player’s result.
Can the same game have different RTP values at different casinos?
Yes. Gates of Olympus was observed at 40 casinos with a recorded RTP range from 94.5 to 96.5. The relevant RTP is the value disclosed for the specific game configuration at the selected operator.
