There are two figures that almost always accompany the details of slot games: RTP and volatility. RTP gives the idea of how much of the money put into play by players will be returned to them by the slot machine. Volatility determines whether it will happen in one or more large payouts, or in several small winnings.
Players often meet both terms while comparing casinos, for example on Slotozilla’s overview of sites that accept PayPal: https://www.slotozilla.com/au/payment-method/paypal-online-casinos. Payment options and game statistics are separate things, though, and the second deserves a closer look. Neither RTP nor volatility predicts the next spin, and neither guarantees a win.
What Does RTP Mean in Slots?
RTP stands for return to player. It is the share of all money wagered that a slot is mathematically designed to pay back over the long run. The rest is the operator’s margin, also known as the house edge.
For example, on a slot with a 96% RTP, £10,000 wagered over a very large number of spins would be expected to return about £9,600, while the operator keeps about £400. In other words, £96 comes back for every £100 wagered, in theory. The figure holds over the long run, not within a single session.
The long run matters here, because RTP is calculated over millions of spins and says little about one session. In a single evening, you can lose your whole stake or win more than you put in, and both outcomes are still consistent with a 96% RTP.
A higher RTP does not guarantee better short-term results either. Over a few hundred spins, a game with a 94% RTP may pay more than one with 97%. Some slots are also released in several RTP versions, and each casino chooses which one to offer, so check the figure in the game you actually play.
What Does Slot Volatility Mean?
Volatility, also known as variance, refers to the payout dispersion in the slot machine. RTP indicates how often the money will return, but volatility indicates how it returns. Although there is no official scale, slots are generally categorized into three categories:
- Low volatility: wins come often but are usually small.
- Medium volatility: wins are less frequent and somewhat larger.
- High volatility: wins are rarer, but the biggest payouts can be much larger.
Just like the RTP, all of these attributes are based on a huge number of spins. High volatility is not an indication of increased RTP or probability of winning; it implies more intervals before hitting a win and larger swings in your bankroll. On the other hand, low volatility does not guarantee security, either.
There is one rule that can be applied to any RNG slot. The result of each game is generated using a random number generator, and the gambling commission, such as the UK Gambling Commission, makes sure that the results are unpredictable. In other words, previous spins have no effect on subsequent spins.
According to Victor Oladapo, an expert on slot games for Slotozilla, the RTP shows how much profit you will get in the long run, whereas volatility shows how bumpy the ride may be.
What Is the Difference Between RTP and Volatility?
RTP refers to the expected return in the long run. Volatility measures the distribution of returns. Third, hit frequency indicates the number of times a spin gives a win. Because these concepts refer to different aspects, they can coexist in any manner – for example, a slot machine with high RTP may also be highly volatile.
|
|
RTP |
Volatility |
Hit frequency |
|
What it describes |
Share of wagers returned over the long run |
How payouts are spread |
How often a spin returns any win |
|
Example |
96% = £96 back per £100, in theory |
High = long gaps, big swings |
25% = about one spin in four pays |
|
What it does not tell you |
Whether you will win in a session |
Whether the next spin wins |
How big the wins are |
Imagine two slots, both at 96% RTP. In one, small wins arrive regularly. On the other, most spins pay nothing, but an occasional win is large. Over millions of spins, both return about the same share, yet a single session feels very different.
How Can You Check RTP and Volatility Before Playing?
Start with the game itself: many slots show the RTP, and sometimes the volatility, in the info or help menu or in the paytable. If a figure is missing, the provider’s documentation or the casino’s support team can usually supply it. In some countries, disclosure is required by law. In Great Britain, operators must show the house edge and either the RTP or the probability of winning before play.
Slotozilla is a useful place to compare games, as its slot reviews list both RTP and volatility. A demo or another casino may run a different RTP version, so trust the figure in the game you actually play. These numbers describe a game’s design, not its outcome. Slots are for adults only and are paid entertainment, so set a budget before you start.