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Understanding RTP and volatility

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RTP is a number often used in casinos but rarely understood. It gives you a good idea of what to expect over a long time, but it won't tell you what will happen in a single session. This guide explains the math behind the games without the marketing talk.

RTP defined

Return to Player is the percentage of total bets that a game is expected to pay back to players over time. For example, if a slot has a 96% RTP, the house keeps 4 cents of every dollar bet on average. The player gets back 96 cents for every dollar spent, when looking at thousands of spins.

The word "average" is very important here. RTP is not a promise for one session. It is a mathematical way of looking at all possible results. In a normal session of 500 spins, you could win 50 times your bet or lose everything. Both of these results are normal for a game with 96% RTP.

House edge across categories

RTP and the house edge are linked. If you add them together, they always make 100%. Different types of games have very different house edges, even if you play with the best strategy:

Game House edge RTP
Blackjack (basic strategy, liberal rules) 0.3% - 0.5% 99.5% - 99.7%
Blackjack (basic strategy, tight rules) 0.5% - 1.5% 98.5% - 99.5%
Video poker (full-pay Jacks or Better) 0.5% 99.5%
Baccarat (Banker bet) 1.06% 98.94%
Baccarat (Player bet) 1.24% 98.76%
Craps (pass / don't pass + max odds) 0.5% - 1.4% 98.6% - 99.5%
European roulette 2.70% 97.30%
French roulette (en prison even bets) 1.35% 98.65%
American roulette 5.26% 94.74%
Modern slots (typical) 3% - 6% 94% - 97%
Modern slots (best RTP available) ~2% ~98%
Keno 25% - 35% 65% - 75%

Blackjack and video poker usually have the lowest house edge if played correctly. Keno has the highest. Slot machine RTP can vary a lot. This is because the same game can be set to different RTP levels by the casino. You should always check the game's info panel to see the actual number for the game you are playing.

Variance and volatility

Variance and volatility both mean the same thing. They describe how much your results in a single session might differ from the long-term average.

  • Low variance. These games give frequent small wins, but big wins are rare. Your money lasts longer, but you are less likely to double your bankroll quickly. Examples include Starburst and classic three-reel slots.
  • Medium variance. This is a mix of both. You get some regular wins and the occasional larger payout. Most modern video slots fall into this category.
  • High variance. You might go a long time without winning, but the payouts can be very large when they happen. Your money can disappear quickly, but it can also grow a lot during a lucky run. Examples include Megaways games and slots focused on large jackpots.

Volatility does not change the long-term RTP. A high-volatility slot and a low-volatility slot with 96% RTP will both return the same amount of money over a very long time. The only difference is how that money is paid out. One gives many small wins, while the other gives fewer big wins. Both have the same expected loss if you play for long enough.

What RTP doesn't tell you

  • What will happen this session. RTP is a long-term rule. In one session, your results can be much higher or lower than the average because of luck.
  • How "due" a game is for a payout. Every spin is a separate event. The game does not remember what happened before. A game is never "due" to pay out.
  • Whether the casino is "loose" or "tight." A slot usually has the same RTP regardless of where you play it, unless the casino has chosen a specific lower setting. Casinos do not change the RTP during play.
  • What variance you'll experience in a given session. Variance is based on statistics. You might see a high-variance pattern on a low-variance game just by chance during a short session.

How to use RTP and variance practically

  • Prefer higher RTP within your preferred variance band. If you like medium-variance slots, choosing one with 97% RTP instead of 94% will save you money over time. While variance is about your playing style, RTP is about the structure of the game.
  • Size bets relative to variance. You need a bigger bankroll for high-variance games because you might go longer without a win. Use the bankroll planner to help choose a bet size that fits your budget.
  • Read the in-game info panel. You can find the RTP in the help screens of most modern slots. Always check this first, as some casinos might use a lower version of the game.
  • Don't chase the gambler's fallacy. Losing several times in a row does not mean you are about to win. Every spin has the same chance of winning as the one before it.

Frequently asked

Is high RTP better than low RTP?
Generally, yes. A 96% RTP slot will return 96 cents for every dollar spent if you play for a very long time. However, "a long time" means tens of thousands of spins. In a short session, luck is much more important than the RTP. A high-RTP slot can still lose you money quickly, while a low-RTP slot can still give you a big win on a single spin.
Does volatility affect RTP?
No, they are different things. Two slots can have the same 96% RTP but different volatility. One might pay out small amounts often, while the other pays out larger amounts less often. Over a long time, the total amount returned to players will be the same.
How do I find the RTP of a specific slot?
Most slots show their RTP in the "info" or "help" menu. If it isn't there, you can usually find it on the game maker's website. Remember that the same game can have different RTP levels depending on which casino you use, so always check the info panel for the game you are actually playing.
Why do casino games even pay out if there's a house edge?
Because of variance. The house edge ensures the casino wins in the long run, but individual players can still have lucky sessions. A player might win thousands during a hot streak even though the math is against them. The casino relies on the millions of sessions played by everyone to make its profit.
Are "hot" and "cold" streaks real?
Streaks are real in that you can see a series of wins or losses, but they don't predict the future. Every spin is random and doesn't depend on what happened before. Thinking a game is "due" to win is a common mistake. Streaks happen by chance, just like getting heads several times in a row when flipping a coin.
What's "hit frequency" and does it matter?
This is how often a game pays out a win of any size. If a slot has a 30% hit frequency, you will win something on about 3 out of every 10 spins. A higher hit frequency can be more fun because you win more often, but it doesn't mean the long-term RTP is higher. It just depends on whether you prefer frequent small wins or waiting for a bigger payout.

Continue reading

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