Many players hear the term house edge but might not be sure what it means in practice. This simple percentage shapes how casino games are set up and how they pay out over time.
Understanding it makes it easier to compare games and set realistic expectations. It also explains why outcomes can swing in the short term even when the long-term maths points one way.
In this blog post, you’ll find what house edge means, how it relates to Return To Player (RTP), how it’s calculated, typical ranges by game, where to find the figures, common myths, and whether it can be reduced.
Read on to learn more.
What Does House Edge Mean For Online Casino Players?
The house edge is the percentage of all money wagered on a game that the casino expects to keep over time. It comes from the game’s rules and payouts, not from how any single session plays out.
For example, if a game has a 2% house edge, the casino expects to retain about £2 for every £100 wagered across many bets. The rest goes back to players as winnings. A lower edge is generally more favourable to players, while a higher one means the casino keeps more.
It’s a long-term measure across all play, so individual results will vary from session to session. That idea leads to a closely related figure you’ll often see in game information: RTP.
House Edge Versus Return To Player (RTP)
House edge and RTP describe the same balance from two angles. House edge shows the share of wagers the casino retains. RTP shows the share theoretically returned to players.
If a slot has a 96% RTP, it pays back about £96 per £100 wagered over a very large number of spins. The remaining 4% is the house edge. Neither number predicts what will happen in a short session; both are averages based on extensive play.
Knowing the difference helps when comparing games. The next step is understanding how these figures are set in the first place.
How Is House Edge Calculated?
Every casino game is built on fixed rules and payout tables. The house edge comes from comparing those payouts with the true probabilities of the outcomes. In short, it’s the maths behind the scenes.
Below are two quick examples that show how the numbers are put together.
Worked Example: Roulette
European roulette has 37 pockets. A straight-up bet on one number pays 35 to 1, but the chance of hitting that number is 1 in 37. Comparing the actual odds with the payout leads to a house edge of about 2.7%. Over many spins, the casino would expect to keep around £2.70 of every £100 wagered.
Worked Example: Blackjack
In blackjack, the edge depends on the rules and on player decisions. With common player-friendly rules and basic strategy, the edge can be around 0.5%. That figure assumes optimal choices over time. If players deviate, the edge increases because the decisions affect the outcomes built into the maths.
With the method in mind, it helps to see how typical edges look across popular games.
What Are Typical House Edge Percentages For Popular Casino Games?
Different games carry different built-in advantages for the house. Here is a general guide to the ranges you’ll often see.
Slots House Edge
Many online slots fall between 2% and 10%. Providers usually publish RTP rather than the house edge, but you can convert it easily by subtracting the RTP from 100%.
Roulette House Edge
European roulette, with one zero, usually has a 2.7% house edge. American roulette adds a double zero, which typically raises the edge to 5.26%.
Blackjack House Edge
Blackjack often sits between about 0.5% and 2%, depending on table rules and how closely players stick to basic strategy. Fewer decks and rules such as the dealer standing on soft 17 can keep the edge lower.
Baccarat And Craps House Edge
In baccarat, banker bets are usually around 1.06% and player bets about 1.24%, while tie bets are much higher. In craps, pass line and don’t pass bets are among the lower-edge options, with some proposition bets rising well above 10%.
Understanding these figures helps set realistic expectations when comparing games. If you want the precise number for a particular title, you can usually find it before you play.
How Can I Check The House Edge On Online Casino Games?
Most online casinos and game providers publish either RTP or house edge in the game rules, help screens, or paytables. On slots, RTP is the norm, so the house edge is simply 100% minus that figure. In table games, the edge comes from the stated rules, such as the number of decks in blackjack or the wheel type in roulette.
If a figure isn’t shown in the game, independent review sites often list it. Checking a couple of sources can give a clearer picture for specific titles.
Once you know the numbers, the natural question is whether they can be changed.
Can Players Reduce The House Edge?
The house edge is built into each game’s design. For most games, it does not move. However, in decision-based games such as blackjack or video poker, following basic strategy can bring the edge down to its lowest achievable level for the rules in use. Strategy charts, understanding the rules, and avoiding common errors all help to keep the edge at that minimum.
In games where outcomes are set by a random number generator with fixed odds, such as most slots, the edge cannot be altered by any approach.
The house advantage always remains, so there is no way to remove it completely. If gambling ever stops being affordable, free and confidential support is available from organisations such as GamCare and GambleAware.
Common Misconceptions About House Edge
A few myths crop up regularly. Clearing them up makes the numbers easier to read.
House edge is not a prediction of what anyone will lose in one evening. It’s a long-term average measured over many rounds.
Betting systems and patterns cannot remove the edge. The advantage comes from the rules and payouts, not from how stakes are arranged.
Talk of hot or cold streaks does not change the probabilities. Each spin or round is independent, so previous outcomes do not influence the next one.
A low house edge does not mean constant wins. It describes the average relationship between wagers and payouts over time, not the rhythm of short-term results.
Viewed this way, house edge and RTP become practical tools: they explain how games are set up, help with comparing options, and keep expectations grounded.
**The information provided in this blog is intended for educational purposes and should not be construed as betting advice or a guarantee of success. Always gamble responsibly.