Online slots can differ considerably in how they play, even when their themes, layouts and bonus features appear similar. Three terms that can help explain some of these differences are RTP, variance and volatility.
RTP describes a game’s theoretical long-term return, while variance and volatility relate to how its potential outcomes are distributed. Understanding these concepts can help you identify the type of slot experience you prefer at NetBet Casino.
However, none of these figures can predict what will happen during an individual spin or playing session. They describe characteristics of a game’s mathematical model rather than providing a way to forecast future results.
What Is RTP in Online Slots?
RTP stands for Return to Player. It is usually expressed as a percentage and represents the theoretical proportion of stakes that a casino game is designed to return to players over a very large number of plays.
For example, imagine an online slot has a theoretical RTP of 96%. This does not mean that a player staking £100 should expect to receive exactly £96 back.
The percentage applies to the game’s mathematical performance over a very large sample rather than an individual player’s session. One person could experience results considerably above or below the theoretical percentage.
RTP should therefore be viewed as long-term information about how a game is designed, not as a guarantee of what you will receive from playing it.
For a more detailed explanation of how the percentage is calculated and what it can tell you about a casino game, read our guide to Casino RTP – What Is Return To Player?
How Does Slot RTP Work?
RTP is based on a game’s underlying mathematical model and is calculated over a very large number of plays.
If a slot has a theoretical RTP of 96%, the remaining percentage represents the game’s theoretical mathematical advantage over the long term. Individual results can still vary substantially in either direction.
This distinction is important because RTP does not work as a short-term target. A slot does not need to return a particular percentage during an individual session, nor does it need to compensate for previous results to move towards its theoretical RTP.
Each outcome should therefore be considered according to the game’s rules rather than assuming previous results determine what will happen next.
Two slots can also have identical or very similar RTP percentages but feel completely different to play. This is where variance and volatility become useful concepts.
Is a Higher RTP Always Better?
A higher RTP means that a greater proportion of stakes is theoretically returned to players over the game’s long-term mathematical model.
However, it does not mean a player is guaranteed better results during a particular session.
For example, one game might have a slightly higher RTP but also have high volatility, meaning its potential outcomes are distributed differently from those of a lower-volatility game.
RTP is therefore useful information when comparing games, but it does not provide a complete picture of how a slot plays.
Other factors such as volatility, game mechanics, bonus features and the type of gameplay you prefer can also be considered when choosing between slots.
RTP vs House Edge: What’s the Difference?
RTP and house edge are closely related concepts, but they describe the mathematical model from different perspectives.
RTP represents the theoretical percentage of stakes returned to players over the long term. House edge represents the mathematical advantage built into a casino game.
For a simple example, a game with a theoretical RTP of 96% corresponds to a theoretical house edge of 4%, assuming the figures are calculated on the same basis.
This does not mean 4% is deducted from every individual stake. Both figures describe long-term mathematical expectations.
Our guide to What is house edge and what does it mean? explores the concept in more detail and explains how it applies to different types of casino games.
What Is Variance in Online Slots?
Variance is a statistical concept that describes how widely results can be spread around an expected value.
In online slots, it helps explain why actual results can vary substantially even when a game has a fixed theoretical RTP.
A game where results are generally distributed relatively close to its expected value would have different variance characteristics from one where outcomes can be spread much more widely.
Variance can become quite mathematical when examined in detail, but players do not need to calculate it themselves to understand its basic purpose.
If you want to explore the concept beyond slots, our guide to What is variance in online casino games? explains how variance relates to different casino games and why short-term results can differ considerably from theoretical expectations.
What Is Volatility in Online Slots?
Volatility is commonly used to describe the general pattern and potential distribution of winning outcomes in a slot.
Online slots are often described as having low, medium or high volatility. However, these categories are broad descriptions rather than a universal measurement system shared by every developer.
Generally, lower-volatility games are associated with more frequent but smaller winning outcomes. Higher-volatility games tend to have winning combinations less frequently, with the potential for larger outcomes when wins do occur.
Volatility does not predict what will happen next. A high-volatility slot could produce several wins close together, while a low-volatility game could still have a sequence of losing spins.
For a deeper explanation of these classifications, our guide to What is volatility in online casino games? looks at what volatility means and how it can affect the overall playing experience.
What Is a Low-Volatility Slot?
Low-volatility slots are generally designed to produce winning outcomes more frequently, with those individual wins tending to be smaller compared with higher-volatility games.
This can create a steadier style of gameplay where smaller-value winning combinations make up a larger part of the game’s mathematical model.
However, low volatility does not mean that a game will produce a win every few spins. It also should not be interpreted as meaning that a slot is “safe” or that losses cannot occur.
Random results can still produce substantial variation during any individual session.
What Is a High-Volatility Slot?
High-volatility slots generally produce winning combinations less frequently than lower-volatility games, while individual winning outcomes can potentially be larger.
These games can sometimes place greater emphasis on bonus rounds and special mechanics such as free spins, multipliers or other features. However, this is not a requirement for every high-volatility title.
The key point is that the distribution of potential outcomes is different. Players can potentially experience longer sequences without winning combinations, and larger potential prizes are never guaranteed.
If this style of gameplay interests you, our guide to Best High Volatility Slots to Play Online looks at a selection of high-volatility games and the different features they offer.
What Is a Medium-Volatility Slot?
Medium-volatility slots broadly sit between low- and high-volatility games.
They may offer a balance between the frequency and potential size of winning combinations, without leaning as heavily towards either end of the volatility spectrum.
However, medium volatility is still a broad classification. One developer’s interpretation of medium volatility may differ from another’s, so the label should be used as a general indication of how a game is designed.
RTP and the individual feature structure can provide additional information when comparing medium-volatility slots.
Variance vs Volatility: What’s the Difference?
Variance and volatility are closely connected and are sometimes used interchangeably when discussing online slots, but they are not technically identical.
Variance is a statistical concept that measures how widely possible outcomes are distributed around an expected value.
Volatility is more commonly used as a practical description of how the distribution of potential outcomes may affect the playing experience. In slots, this is often communicated using low, medium and high volatility classifications.
In simple terms, variance is the underlying statistical concept, while volatility is often the more player-friendly way of describing the general characteristics associated with that variation.
RTP vs Volatility: What’s the Difference?
RTP and volatility tell you different things about a slot.
RTP describes the theoretical proportion of stakes returned over the game’s long-term mathematical model. Volatility provides information about how the game’s potential outcomes are distributed.
Imagine two hypothetical slots both have an RTP of 96%. The first is low volatility and generally distributes its potential across more frequent, smaller winning outcomes. The second is high volatility and generally produces wins less frequently while allowing for potentially larger individual outcomes.
Their theoretical RTP can be identical even though their playing styles are noticeably different.
This is why looking at RTP alone cannot tell you everything about how a slot is designed to play.
Can Two Slots Have the Same RTP but Different Volatility?
Yes. Slots can have the same theoretical RTP while having very different volatility profiles.
A lower-volatility game might distribute more of its theoretical return through relatively frequent smaller winning combinations.
A higher-volatility title could concentrate more of its potential into less frequent larger outcomes or bonus features.
Neither approach changes what RTP itself represents. Instead, volatility helps provide additional context about how the potential outcomes contributing to that long-term percentage are distributed.
How Do Bonus Features Affect Volatility?
Bonus features can form an important part of a slot’s overall mathematical model.
Some games concentrate a significant part of their potential into free spins, multipliers, Hold & Win rounds or other bonus features. This can contribute to a more volatile style of gameplay.
Other games distribute more of their potential through regular base-game combinations.
However, a slot should not automatically be classified as high volatility simply because it contains several bonus features. The overall mathematical design determines its volatility rather than the number of features listed in the paytable.
How to Choose Between Low, Medium and High Volatility
Choosing a volatility level is primarily about the type of gameplay you prefer.
If you prefer games generally characterised by more frequent smaller winning outcomes, you may be more interested in lower-volatility slots.
If you are comfortable with the possibility of longer gaps between winning combinations in exchange for the potential for larger individual outcomes, higher-volatility games may better match that preference.
Medium-volatility slots offer another option for players who prefer characteristics somewhere between those two ends of the spectrum.
None of these categories provides a strategy for improving your chances of winning. Volatility simply provides information about how the game’s potential outcomes are structured.
Should You Choose a Slot Based on RTP?
RTP can be useful when comparing online slots, but it should not necessarily be the only consideration.
Volatility provides additional information about how potential outcomes are distributed, while the game’s mechanics can tell you what type of experience to expect from the reels.
You might also consider whether you enjoy traditional paylines, cascading reels, free spins, Hold & Win features, multipliers or other mechanics.
Most importantly, a higher RTP should never be interpreted as a prediction of your individual results. It remains a theoretical long-term figure.
How to Check RTP and Volatility at NetBet Casino
When exploring slots at NetBet Casino, check the game’s information section or paytable for details about its RTP and, where available, volatility.
If an RTP percentage is displayed, remember that it represents a theoretical long-term return rather than the amount you should expect from an individual session.
Where volatility information is provided, use it as a general indication of how the game’s potential outcomes are distributed.
You can also review the paytable and feature descriptions to understand how free spins, multipliers, Wilds and other bonus mechanics work.
Combining this information gives you a clearer picture of a slot’s design and can help you choose games that better match the style of gameplay you enjoy.
RTP, Variance & Volatility FAQs
What does 96% RTP mean on a slot?
A 96% RTP means that the slot is theoretically designed to return 96% of stakes across a very large number of plays. It does not mean that an individual player staking £100 will receive exactly £96 back.
Is high or low volatility better?
Neither is inherently better. Lower-volatility slots are generally associated with more frequent smaller winning outcomes, while higher-volatility games generally produce wins less frequently with the potential for larger outcomes. The choice depends on the style of gameplay you prefer.
Are variance and volatility the same thing?
Variance and volatility are closely related and are sometimes used interchangeably when discussing slots, but they are not technically identical. Variance is a statistical measure relating to the spread of outcomes, while volatility is commonly used to describe the general pattern and intensity of those outcomes.
When you choose NetBet Casino, you can enjoy a whole range of top-quality slots. Whatever you choose, always remember to bet responsibly. Here at NetBet Casino, player well-being is our number one priority – check out our Safer Gambling tips and tools page for more information.
