RTP and Volatility Explained: What Every Slot Player Should Know
If you play online slots, two numbers matter more than any flashy bonus or theme: RTP and volatility. Understanding them will not guarantee wins, but it will help you choose games that match your budget and play style.
What is RTP?
Return to Player (RTP) is a theoretical percentage that represents how much a slot game pays back to players over an extremely large number of spins—typically millions. An RTP of 96 % means that for every £100 wagered, the game returns £96 on average. The remaining £4 is the house edge—the casino's built-in profit margin.
Crucially, RTP is a long-term statistical average, not a prediction for any individual session. In a single sitting of 200 spins you might win 150 % of your stake, lose everything, or land anywhere in between. RTP only converges on its stated value over hundreds of thousands of spins.
Most modern video slots have RTPs between 94 % and 97 %. Anything above 96 % is generally considered “above average”; below 94 % is on the lower end. Some games—notably progressive jackpot slots where a portion of each bet feeds the jackpot pool—have base-game RTPs as low as 88–92 %, with the remaining percentage attributed to the jackpot contribution.
What is volatility?
Volatility (also called variance) describes the risk profile of a slot. It tells you how the game distributes its payouts:
- Low volatility: Frequent but small wins. Your balance tends to fluctuate gently. These games are suited to players with smaller budgets who want longer play sessions.
- Medium volatility: A balanced mix of small and large payouts. The most common category.
- High volatility: Wins are less frequent but tend to be larger when they land. Your balance can swing dramatically—long dry spells followed by significant payouts. These games require a bigger bankroll and a higher tolerance for risk.
Two games can have the exact same RTP but feel completely different to play because of their volatility. A low-volatility slot at 96 % RTP will give you steady, small returns; a high-volatility slot at 96 % RTP will have longer losing streaks punctuated by bigger wins. Over millions of spins, both return 96 % of money wagered—but the journey to that average is very different.
How RTP and volatility work together
Think of RTP as “how much” the game returns and volatility as “how it returns it”. A helpful analogy: imagine two colleagues who each owe you £100.
- Colleague A (low volatility): Pays you £5 every day for 20 days. Predictable and steady.
- Colleague B (high volatility): Pays you nothing for 19 days, then hands you £100 on day 20. You get the same total, but the experience is very different.
Neither approach is objectively “better”—it depends on your personal preference and how much uncertainty you are comfortable with.
Where to find RTP and volatility information
Game developers are required to publish RTP figures, and most do so in the game's “Info” or “Help” menu (usually accessible via an “i” icon on the game screen). Some casinos also list the RTP for each game in their lobby or on the game's detail page.
Volatility is less consistently disclosed. Some developers (like NetEnt and Pragmatic Play) include a volatility rating in the game information; others do not. Independent review sites and slot databases are often the best source for volatility data.
Be aware that some casinos operate under agreements that allow game providers to offer different RTP settings. A game that runs at 96.5 % RTP on one casino might be set to 94.5 % on another. This practice is legal and disclosed in the game rules, but it means you should always check the RTP at the specific casino where you play, not just the “default” RTP listed by the developer.
Practical tips for choosing slots
- Match volatility to your bankroll: If you have a £20 budget, a high-volatility slot can eat it up in minutes without a single meaningful win. A low-volatility slot will give you more play time.
- Favour higher RTPs: All else being equal, a 97 % RTP slot is statistically more generous than a 94 % one. Over hundreds of sessions, this difference adds up.
- Check the RTP at your casino: Do not assume the default developer RTP applies. Look in the game's info menu for the actual figure.
- Understand progressive jackpots: The base-game RTP of a progressive slot is lower because part of each bet feeds the jackpot. If you are not chasing the jackpot, you are playing at a statistical disadvantage compared to a non-progressive game.
- Set a loss limit: Volatility means variance, and variance means you can lose your entire session budget. Decide on a maximum loss before you start playing and stop when you reach it, regardless of how the session is going.
Common misconceptions
“A game is due to pay out.” This is the gambler's fallacy. Each spin is an independent event. The RNG has no memory of previous outcomes. A slot that has not paid a big win in 1,000 spins is no more likely to pay on spin 1,001 than it was on spin 1.
“Higher RTP means I will win.” RTP is a long-term average, not a session guarantee. You can absolutely lose money on a 98 % RTP slot in a single session. RTP tells you the game's theoretical generosity, not your personal outcome.
“Casinos can change the RTP mid-session.” This is not possible. RTP settings are configured at the server level and cannot be adjusted on the fly for individual players. Any change must be pre-configured and disclosed in the game rules.
Summary
RTP and volatility are the two most useful metrics for choosing which slots to play. RTP tells you the theoretical return; volatility tells you how bumpy the ride will be. Neither can predict individual outcomes, but together they help you select games that match your budget, risk tolerance, and playing style.
For more on how we evaluate games and operators, visit our How We Rate page or browse our weekly casino rankings.