Casino volatility describes how a casino game’s results are distributed over time, particularly the relationship between the frequency of wins and the size of those wins. It is especially common as a measurement for slot games, where two games with similar RTP can produce very different patterns of results.
Volatility is therefore different from RTP. RTP describes the theoretical long-term return, while volatility describes the pattern and size of the outcomes. (bet365 Help Centre)
What Is Low Volatility?
A low-volatility game generally produces winning outcomes more frequently, but those wins tend to be smaller.
Imagine two games that both have a theoretical RTP of 96%. The first might produce many relatively small winning combinations. The second might produce fewer wins but occasionally award a much larger payout.
The RTP can be similar, but the distribution of results can be very different.
This is why volatility is useful for understanding how a game behaves beyond its headline RTP percentage.
What Is High Volatility?
A high-volatility game generally has less frequent winning outcomes, with the possibility of larger individual payouts.
This does not mean that a high-volatility game is guaranteed to produce a large win. Rather, its mathematical design allows outcomes to be distributed in a way where larger prizes occur less frequently.
Bet365 describes high-volatility games as producing larger wins at a more irregular pace, while lower-volatility games tend to provide more frequent, smaller-to-medium-sized wins. (bet365 Help Centre)
Medium Volatility
Some games are described as having medium or medium-high volatility.
These games sit between the two extremes. Their results may include a mixture of smaller, more frequent wins and larger, less frequent payouts.
There is no universal numerical scale that every game provider uses for low, medium and high volatility. A game’s volatility classification is generally based on its own mathematical model and the information supplied by the game developer.
Volatility Does Not Mean RTP
RTP and volatility answer different questions.
| Measure | What it describes |
| RTP | Theoretical long-term percentage returned |
| Volatility | Distribution and size of winning outcomes |
| House edge | Theoretical mathematical advantage of the casino |
For example, two slots could both have an RTP of 96%, but one could have low volatility while the other has high volatility.
The 96% figure alone would not tell you how frequently their winning outcomes occur or how those payouts are distributed.
Does High Volatility Mean a Worse Game?
Not necessarily.
Volatility is a characteristic of the game’s mathematical design, not a rating of whether a game is good or bad.
A high-volatility game can have a higher RTP than a low-volatility game, and a low-volatility game can have a lower RTP than a high-volatility game.
Therefore, volatility should not be interpreted as another name for house edge.
How Does Volatility Affect Short-Term Results?
Volatility becomes particularly noticeable over shorter periods.
A high-volatility game can produce larger swings between outcomes because significant payouts may be less frequent. A low-volatility game can produce a steadier sequence of smaller outcomes.
Importantly, neither pattern guarantees a particular result during an individual session. Random outcomes can still produce unusual short-term sequences.
Why Is Volatility Important in Game Mechanics?
Volatility is determined by the underlying mathematical structure of a game. Factors such as payout sizes, winning probabilities and the distribution of prizes all contribute to the way outcomes are spread.
That makes volatility an important part of casino game mechanics, alongside RTP, house edge and probability.
Understanding volatility provides another layer of information when examining how a casino game is designed. Rather than simply asking how much a game theoretically returns, it helps explain how those returns can be distributed across its many possible outcomes.
