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Frequently Asked Questions RTP, Volatility and Our Data
The questions we get asked most, answered plainly. If something here isn’t covered, the guides go into more depth — and you can always tell us what’s missing.

RTP Basics
What is RTP?
Return to player is the proportion of all money staked on a slot that the game returns to players over its lifetime. A 96% slot returns £96 for every £100 put through it, measured across millions of spins by every player combined — not by you, and not tonight. Our full guide covers it in depth: What Is RTP in Slots?
How is RTP calculated?
It's built into the game's maths model by the studio, then independently tested and certified before release. The figure comes from the probability and value of every possible outcome, weighted together — it isn't measured from actual play, it's the designed result that actual play converges on over enormous numbers of spins.
What counts as a good RTP?
The industry midpoint sits around 96%, so anything above is better than average. But the comparison that saves you more money is between builds of the same game rather than against a benchmark — a slot you want to play running at 96.71% at one casino and 94.51% at another is a bigger decision than switching games.
Does RTP tell me what I'll win tonight?
No. RTP describes a long-run average across the whole player base, and any individual session is far too small a sample to reflect it. You can lose everything on a 99% slot and double your money on a 90% one. What RTP governs is the rate your budget drains across many sessions, not the result of any single one.
RTP and Your Casino
Why does the same slot have different RTPs at different casinos?
Studios release games in several RTP configurations and let each operator choose which to license. The reels, bonus round and maximum win are identical across builds — only the return differs. Nothing on screen tells you which version you've opened, which is why the difference goes almost entirely unnoticed.
How do I check which version I'm playing?
Open the game's information or paytable panel, usually reached from a menu icon in the corner. Licensed operators are required to display the return to player for the build they're actually running. It takes about ten seconds, it's the definitive source, and it can't be out of date the way a published figure elsewhere can.
Is it legal for a casino to run a lower-RTP version?
Yes, provided it's disclosed. Operators choose from configurations the studio has certified, and licensed sites must display the figure for the version in play. It isn't hidden, and it isn't a loophole — it's simply a commercial choice that almost nobody checks.
Do casinos change which version they run?
Occasionally. Build changes tend to follow licensing renegotiations rather than happening frequently, so a slot can hold the same RTP for months and then move without any announcement. That's why every figure we publish carries the date it was last confirmed, and why the game's own panel is worth a glance before you play.
Volatility and Choosing Slots
What is volatility?
It describes how a slot delivers its return rather than how much it returns. Low volatility means frequent small wins; high volatility means long stretches of nothing punctuated by rare large ones. Two games with identical RTP can sit at opposite ends of the scale and feel like completely different games.
Is high or low volatility better?
Neither — they suit different budgets and different goals. Low volatility stretches a small budget and keeps sessions alive. High volatility offers the possibility of a standout result at a much higher risk of losing everything quickly. Our modelling puts the chance of busting a £100 balance over 500 spins at roughly 7% on a low-volatility slot and 53% on a high-volatility one, at the same RTP.
How much bankroll do I need?
It depends on volatility rather than RTP. Roughly 60 to 80 times your stake is workable on a low-volatility game, around 100 times on a medium one, and 150 to 200 times on a high-volatility slot — because volatile games need enough spins to reach the bonus round where their value sits.
Does a bigger maximum win mean a better slot?
Not for most players. Maximum wins land so rarely that they contribute almost nothing to a game's overall return. A 50,000x ceiling and a 96% RTP describe two different things — one an outcome almost nobody sees, the other what happens to everyone else. Large ceilings are usually funded by higher volatility.
Our Data
Where do your RTP figures come from?
From the game's own information panel at each casino — the same place you'd check it yourself. That's the build the operator is actually running, as opposed to the studio's published specification, which is a ceiling rather than a guarantee. Where the two differ, we show both.
How often are the figures checked?
Regularly, and every entry carries the date it was last confirmed. Operators don't switch builds often, so figures tend to hold for a good while and then move without notice. Treat ours as a strong starting point rather than a live feed, and confirm in the game before you play.
Which casinos do you cover?
Our main coverage is operators licensed by the UK Gambling Commission, where paytable disclosure is enforceable. We also list crypto and offshore operators separately, and flag clearly where a figure can't be verified to the same standard.
Why are crypto casinos listed separately?
Because the verification isn't equivalent. Licensed operators are bound by enforceable disclosure and player-protection requirements. Outside that framework, published figures can't be checked to the same standard, so presenting the two together as though they were comparable would mislead you about how much confidence to place in the numbers. See crypto casinos for the detail.
Written by Jon Pill, Senior Editor · Reviewed by Mark Gruetze · Last updated Jul 2026


