Two Different Measurements, Two Different Questions
RTP and volatility are both essential numbers for understanding a slot game — but they answer completely different questions:
- RTP answers: "How much of all wagered money does this game pay back over time?"
- Volatility answers: "How does the game distribute those payouts — in frequent small amounts or rare large amounts?"
You need both pieces of information to have a complete picture of a game's behaviour.
A Quick Recap: What Is RTP?
As covered in our full RTP guide, Return to Player (RTP) is a theoretical long-term percentage. A slot with 96% RTP returns £96 per £100 wagered across millions of spins. It describes the overall mathematical generosity of the game.
What Is Volatility (Variance)?
Volatility — also called variance — describes the pattern of how wins arrive. A slot can have a high RTP but deliver it in entirely different ways depending on its volatility level.
Low Volatility Slots
- Win frequently, but wins are small.
- Bankroll fluctuates gradually — fewer dramatic swings.
- Good for players with smaller budgets or longer play sessions.
- Examples: many classic fruit slots, Starburst (medium-low).
Medium Volatility Slots
- Balanced mix of win frequency and payout size.
- The "middle ground" that suits many players.
- Moderate bankroll requirements.
High Volatility Slots
- Wins arrive infrequently, but individual payouts can be large.
- Long losing runs are common — patience and bankroll depth required.
- Examples: Book of Dead, Deadwood, many Pragmatic Play megaways titles.
Why a High RTP Doesn't Guarantee Frequent Wins
This is the most common misunderstanding. Consider two imaginary slots:
| Game | RTP | Volatility | What Happens in a 100-Spin Session |
|---|---|---|---|
| Slot A | 96% | Low | Wins on roughly 40–50% of spins; small amounts each time |
| Slot B | 96% | High | Wins on 10–15% of spins; occasional large hit or bonus |
Both games have identical RTPs. Yet your short-session experience will be radically different. Slot A feels consistently active. Slot B will feel dead for long stretches, then potentially deliver a large payout. The RTP figure alone tells you nothing about this experience.
How to Use Both Metrics When Choosing a Slot
- Define your goal. Are you playing for entertainment duration, or chasing a large win potential?
- Match volatility to your bankroll. High-volatility slots need a larger stake-to-bankroll ratio to survive losing runs.
- Use RTP to compare games within the same volatility tier. Between two high-volatility slots, the one with higher RTP is mathematically preferable over time.
- Check both figures before playing — they're usually available in the game's paytable or info screen.
Does Volatility Affect RTP?
No — volatility and RTP are independent settings. A developer can build a high-volatility game with a high RTP or a low-volatility game with a low RTP. The RTP is set by the overall mathematical model; the volatility is determined by how wins are sized and distributed within that model.
Summary: The Combination That Matters
Think of RTP as describing how much the game pays back, and volatility as describing how it pays back. The ideal combination depends entirely on your personal playing style and budget:
- High RTP + Low Volatility = Long, steady, relatively predictable sessions.
- High RTP + High Volatility = Potentially rewarding, but requiring patience and bankroll depth.
- Low RTP + High Volatility = The least favourable mathematical combination for players.