RTP is a long-run measure
Return to player is a theoretical or measured long-run share of stakes returned as prizes under specified game conditions. The Gambling Commission explains that it is achieved across a very large number of plays rather than each session. A short series of results can differ sharply from that average.
The complement of a theoretical 96% RTP is a 4% house edge, using the same mathematical assumptions. That relationship does not put a 4% ceiling on a player’s losses. In one session, it is possible to lose the whole amount used.
Turnover is not your starting balance
If £10 is repeatedly staked, the total of all stakes can exceed £10. RTP relates to that turnover, not automatically to the first deposit. A £100 deposit and £100 of total stakes are different inputs, so do not substitute one for the other in a calculation.
As a mathematical illustration, £200 of turnover multiplied by a 4% house edge is £8 of theoretical average loss. It is not an expected invoice, a typical personal result or an amount that makes a bonus safe. Individual outcomes can be much larger in either direction.
Volatility describes the spread
Volatility or variance concerns how widely outcomes are distributed. Two games can have the same theoretical RTP while distributing returns differently. A small number of large prizes can create a different experience from more frequent smaller prizes.
A label such as high volatility is not a completion probability for a wagering requirement. Nor does a losing run mean a win is due. Do not combine marketing labels with an RTP percentage to invent a precise session forecast.
Read the game version you are using
Use the game’s own information screen for the version and rules in front of you. A review of another version or configuration may describe different mathematics. Record the title, provider and displayed information if you need to ask a question.
Our calculator deals only with offer turnover. It avoids projecting winnings or using RTP to recommend a stake. Spending limits, time limits and the option not to gamble are more useful decisions than trying to infer the next result from a long-run statistic.
Sources & scope
Primary sources checked 9 November 2026. These explain the general framework. An individual offer or dispute depends on its own facts and current terms.
Prepared with AI assistance from public sources; no hands-on casino testing is claimed. Read our editorial method.