House Edge Explained: How Casinos Turn a Profit
Updated on June 30, 2026 by the editorial team
House edge is the built-in margin that keeps a casino in business. It is the percentage of every pound wagered that the game holds back over the long run, and it is the reason the house comes out ahead across millions of rounds even when individual players walk away winners. On a game with a 3% edge, roughly £3 of every £100 staked stays with the house over time and £97 flows back to players.
This page shows you what that number actually costs you at the table, how it differs from RTP, the practical moves that shrink the edge you personally face, and a game-by-game breakdown so you can pick where your bankroll lasts longest at FatPirate.
WO
Wolf Gold
ST
Starburst
CR
Crazy Coin Flip
GO
Gonzo's Quest
What the house edge really costs you per spin
The house edge is a percentage. It tells you the share of your total stakes that a game is designed to keep over a very large number of rounds. Nothing about tonight, nothing about your next hand. Just the long-run maths baked into the rules.
Picture £100 fed through a game with a 5% edge, spin after spin, over its lifetime. Around £95 comes back to players and £5 stays with the house. That £5 is not a fee you pay once. It is skimmed a fraction at a time from every wager, which is why the number matters more the longer you sit down.
Here is what that gives you in practice. A lower edge means your money drains slower, so the same £20 buys more spins and more table time. Swap a 5% game for a 1% one and your bankroll lasts, on average, several times longer for the identical stake. You are not buying wins. You are buying playtime, and the edge sets the price.
One caveat before you treat the figure as destiny. The house edge is a long-run average measured across huge samples no single player will ever hit. Your own session swims inside the noise around it. Read it as a cost-of-play comparison, not a forecast for the next hour.
Why house edge and RTP are two sides of the same coin
People mix these up constantly, so let us settle it. Return to player (RTP) and house edge describe the exact same thing from opposite ends. Add them together and you always get 100%.
A slot rated 96% RTP carries a 4% house edge. A blackjack game returning 99.5% to skilled players hands the house just 0.5%. The RTP is what comes back to the room; the edge is what the operator keeps. If you know one, you know the other by subtraction.
Slots and video machines tend to advertise RTP, since it sounds friendlier to players. Table games are more often described by their edge, because the number is tiny and flattering to the house. Same maths, different label. When you compare a 96% slot against a roulette wheel quoted at a 2.7% edge, flip one figure so you are comparing like for like: that wheel returns 97.3%, so it is fractionally kinder than the slot over the long haul.
Want the full breakdown from the return side? Our RTP explained guide covers where to read the percentage on any FatPirate title.
Practical moves that shrink the edge you face
You cannot delete the house edge. It is the price of admission. But the edge is not fixed across the floor, and a handful of choices move real money back into your pocket over a month of play.
Pick your game first. This is the biggest lever by far. Blackjack played with correct basic strategy runs an edge near 0.5%, while a progressive jackpot slot can charge 8% or more. Same £50, wildly different burn rate.
Then tighten the rules within a game. On roulette, choose the single-zero European wheel over the double-zero American one and the edge drops from 5.26% to 2.7%. On blackjack, tables that pay 3:2 on a natural rather than 6:5 are markedly cheaper. On baccarat, the banker bet at roughly 1.06% beats the player bet, and the tie bet is a trap you should skip entirely.
A few more habits that pay off:
- Learn basic strategy for any game that rewards decisions. In blackjack and video poker, playing the wrong move quietly adds a percentage point or two to the edge you carry.
- Favour higher-RTP slots. At FatPirate the reels from BGaming, Yggdrasil, Thunderkick, Spinomenal and Platipus mostly sit in the 94% to 98% band, so lean towards the top of that range.
- Skip side bets. Insurance, tie bets and jackpot side wagers almost always carry a fat edge dressed up as excitement.
- Match your stake to your bankroll and set a stop. A slower edge means little if you triple your bet size to chase a loss.
None of this guarantees a winning night. It simply means you pay the house less for the same hours of play.
How much each game holds back: a side-by-side look
The gap between the cheapest and priciest games on the floor is enormous. This table shows the typical house edge by game, the matching RTP, and what it means for how long your money survives.
| Game | Typical house edge | Matching RTP | What it means for your bankroll |
|---|---|---|---|
| Blackjack (basic strategy) | 0.5% - 1% | 99% - 99.5% | Money lasts longest on the floor |
| Baccarat (banker bet) | ~1.06% | ~98.9% | One simple bet, very low cost |
| Video poker (full-pay) | 0.5% - 2% | 98% - 99.5% | Cheap only if you play it correctly |
| European roulette | ~2.7% | ~97.3% | Single zero beats the American wheel |
| Online slots | 2% - 6% | 94% - 98% | Huge spread, aim for the higher RTP |
| American roulette | ~5.26% | ~94.74% | The extra zero doubles your cost |
| Progressive jackpot slots | 6% - 12% | 88% - 94% | Lower base return, bigger dream |
Read down the left column and the pattern is blunt. Blackjack by the book costs you well under 1%, while a progressive slot can charge more than ten times that for the shot at a life-changing jackpot. Neither is wrong to play. Just know what you are paying for the thrill, and spread your bankroll accordingly.
The house edge behind the FatPirate welcome offer
The edge also shapes how a bonus really works, and it is worth doing the sums before you opt in. FatPirate matches your first deposit with 100% up to £1,000 + 100 FS, which sounds like free money until wagering enters the picture.
The bonus carries x40 playthrough and you get 7 days to clear it. That wagering requirement interacts directly with the house edge. Every time you cycle the bonus through a game, the edge nibbles a slice. On a 4% slot, wagering £4,000 to clear a £100 bonus means you statistically leave around £160 of expected value in the machine before the bonus can turn into withdrawable cash.
This is exactly why lower-edge games are often restricted or count less towards wagering. A casino cannot let you clear a match on 0.5%-edge blackjack, or the maths would tip against the house. So the practical play is simple: treat the welcome offer as extended playtime rather than guaranteed profit, deposit at least £20 to trigger it, and pick eligible slots at the higher end of the RTP range to soften the grind. Our welcome bonus page walks through the full terms.
Questions players ask about the house edge
Can I beat the house edge in the long run?
Not on standard casino games. The edge is fixed in the rules and guarantees the house a profit across large volumes of play, no matter how you bet. You can win in any single session because variance runs wild in the short term, but over thousands of rounds the maths pulls results towards the built-in margin. Skill games like blackjack and video poker let you minimise the edge to a fraction of a percent, never erase it.
Which game has the lowest house edge at FatPirate?
Blackjack played with correct basic strategy sits at the bottom, often around 0.5%, followed closely by baccarat on the banker bet at roughly 1.06%. Full-pay video poker can rival them if you play every hand right. Slots run wider, from about 2% up to 6% depending on the title, so check the RTP before you spin.
Does a bigger stake change the house edge?
No. The edge is a percentage, so it applies to whatever you wager. Betting £1 or £100 per round faces the same 4% on a 96% slot. A larger stake does not raise or lower the edge; it simply means each round costs you more in absolute pounds and your bankroll moves faster in both directions.
Why does the casino win if some players clearly win money?
Because the edge works across the whole player pool over time, not against any one person. Plenty of players cash out ahead on a given night, funded by the many who lose. Add up every wager placed and the house keeps its slice from the total. Individual luck is real and short-lived; the aggregate margin is steady and relentless.
Is the house edge the same as the wagering requirement?
No, but they work together. The house edge is the game's built-in margin per wager. The wagering requirement is how many times you must bet a bonus before withdrawing it. When you run a bonus through the wagering, the house edge quietly erodes its value each cycle, which is why a big match with high playthrough is worth less than it first looks.
Understanding the edge will not make you a guaranteed winner. It does make you a sharper one, spending your bankroll where it stretches furthest and reading every bonus for what it truly delivers.
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