Every online slot and casino game advertises an RTP percentage — but most players have only a vague idea what the number actually means or why it matters. This short guide explains what Return to Player tells you, how operators calculate it, and how to combine RTP with volatility when choosing games.
What Is RTP?
RTP (Return to Player) is the percentage of all wagers a casino game returns to players over millions of spins. If a slot has an RTP of 96%, the game is designed to pay back £96 for every £100 wagered on average. The remaining 4% is the house edge — the casino's expected long-term profit margin.
The figure is statistical, not a guarantee. In any single session you could win big, lose your entire stake, or land somewhere in between. RTP only describes what happens across a vast sample of plays.
Why RTP Matters for Players
RTP is the single most reliable signal of a slot's long-term generosity. A 97% RTP game returns £6 more per £100 staked, on average, than a 91% game. Over a year of regular play, that difference compounds into real money.
That said, RTP says nothing about session-to-session swings. A high-RTP, high-volatility game can still bleed your bankroll for hours before delivering a big win. To balance the picture, pair RTP with volatility and your tolerance for variance.
How Is RTP Calculated?
RTP is calculated by dividing total player winnings by total player wagers across the lifetime of a game, then expressing the result as a percentage. Game studios run simulations of hundreds of millions of spins before launch, and independent labs (eGaming Labs, GLI, iTech Labs) verify the figure against real player data.
UK casinos licensed by the Gambling Commission must display the certified RTP of every slot they offer — usually inside the game's information panel or paytable.
RTP vs. Variance (Volatility)
RTP and volatility describe different things. RTP is the long-run payback rate; volatility is how those payouts are distributed.
- Low volatility:
- small, frequent wins. Bankroll lasts longer; jackpots are modest.
- Medium volatility:
- a balanced mix of small wins and occasional larger hits.
- High volatility:
- long dry spells punctuated by rare, large payouts.
Two slots can share the same 96% RTP but feel completely different at the reels. Match the volatility to your bankroll and session goals.
How to Find Higher-RTP Slots
Start with our shortlist of the best payout slots in the UK — every game on it has an RTP of 97% or higher. From there, learn how wagering requirements interact with bonus play, because a generous RTP gets wiped out by a 50× rollover.
