Have you ever heard the phrase “the house always wins”? That’s one of life’s most undeniable truths, and it comes from a simple thing called the “house edge”.
The house edge represents the share of each bet that the casino expects to retain over time. It embodies the built-in mathematical advantage that ensures the house will operate at a profit in the long run-even on nights when individual players walk away with profits.
The logic is fairly simple. A game with a 2% house edge ultimately retains 2 of every 100 units wagered and returns the remaining 98 to players. Because it is mathematical, this advantage is also totally unbiased. It neither favors nor discriminates against any individual.
To put even more directly, the RTP advertises what comes back, while the house edge admits what stays behind. The rest of this guide, part of OlyBet’s Casino Basics hub, works through it game by game.
This guide covers:
- What house edge means, and how it relates to RTP
- The house edge for blackjack, baccarat, roulette, slots, craps and video poker, in real percentages
- Which casino games carry the lowest house edge, and which quietly empty a wallet
- Whether strategy genuinely reduces the house edge, and by how much
What house edge means, and how it relates to RTP
The house edge is the casino’s average long-run take, expressed as a percentage of each wager. RTP, is the same figure stated from the player’s side: the share handed back over millions (this is VERY important) of rounds. The two always sum to 100. A slot advertising 96% RTP is quietly confessing a 4% house edge; a blackjack table returning 99.5% keeps just 0.5%.
Now, keep in mind the figures are absolutely theoretical. Neither number promises anything about the next hour or week, since we are talking about immense amounts of data. OlyBet keeps a plain-English guide to RTP and a companion piece on slot volatility. Together, they explain why two games sharing one RTP can still behave surprisingly differently.
How is the house edge calculated
That’s quite simple. The figure is the gap between the true odds of a bet and the odds the casino actually pays, averaged across every outcome. European roulette makes the cleanest demonstration.
A single-number bet pays 35 to 1, yet the wheel holds 37 pockets, so a fair payout would be 36 to 1. That one missing unit, spread across 37 pockets, is the entire house edge: 1 in 37, or 2.7%. Every game runs on the same principle, with the maths growing fiddlier as the bets multiply. For the exhaustive, gloriously obsessive version, the Wizard of Odds has computed the edge of essentially everything.
House edge by casino game
The numbers below assume sensible bets and standard rules. Edges shift with variants, side bets and the occasional house rule designed to be overlooked, so the published paytable always has the final say.
| Game | House edge | RTP | Notes |
|---|---|---|---|
| Video poker (9/6 Jacks or Better, optimal) | ~0.46% | ~99.54% | Skill game, demands perfect play |
| Blackjack (basic strategy) | ~0.5% | ~99.5% | Lowest table game with correct strategy |
| Baccarat (Banker) | ~1.06% | ~98.94% | Mathematically the strongest bet |
| Baccarat (Player) | ~1.24% | ~98.76% | A whisker behind Banker |
| Craps (pass line) | ~1.41% | ~98.59% | Drops further with odds bets |
| European roulette | ~2.7% | ~97.3% | Single zero |
| Online slots (average) | ~4% | ~96% | Ranges roughly 88-98% |
| American roulette | ~5.26% | ~94.74% | The second zero does the damage |
| Baccarat (Tie) | ~14.4% | ~85.6% | The worst bet on the baccarat table |
| Keno | ~25%+ | ≤75% | The house’s favourite, and it shows |
Blackjack house edge
Blackjack carries the lowest house edge of any table game in a casino, physical or otherwise and it is roughly 0.5% under basic strategy. Mind that the figure is conditional and assumes you play perfectly. If you play on instinct, agonise over every sixteen, and the edge swells past 2% with alarming ease.
Baccarat house edge
Baccarat rewards the laziest possible type of player. Your best choice is to bet Banker and stop thinking. The Banker bet runs a 1.06% house edge. The Player bet runs at a slightly stiffer 1.24%. The difference across an evening is real but modest. The Tie bet, dressed up in its tempting 8 to 1 payout, hides a 14.4% house edge and should be best admired from a distance. The game deals itself, which is much of the appeal, and live baccarat asks nothing of a player beyond choosing the sensible wager.
Roulette house edge: European versus American
Geography costs money and nowhere is this more evident than the roulette table. The European wheel, with a single zero, runs a 2.7% house edge. The American wheel adds a second green pocket, the double zero. In doing so nearly doubles the edge to 5.26% while changing almost nothing a player can see. The only sane response is to choose the single-zero table every time, a point set out in full in OlyBet’s European versus American roulette guide. European roulette online is the version worth seeking.
Slots, video poker and craps
Away from the felt, the spread widens. Online slots average around 4% but range from a generous 2% to a punishing 12% depending on the title. Slots are really the wild west of casino games and it is precisely why checking the RTP before spinning matters; the full library sits under online slots.
Video poker is the quiet overachiever: a full-pay Jacks or Better machine played at its best cuts the house edge down to roughly 0.46%. For anyone willing to learn the correct holds, this is an unlikely rival to blackjack. It seems crazy, but craps is one of the nicest games on the floor, with the pass-line bet coming in at 1.41%, and even lower if you add in the odds bets. For the record, Keno is where math goes to die, regularly charging 25% or more.
Casino games with the lowest house edge
For a budget that needs to last, four games stand clear of the pack: video poker and blackjack at roughly 0.5%, baccarat’s Banker bet at 1.06%, and the craps pass line at 1.41%. All four are available, many with real dealers, across OlyBet’s live casino. The pattern is not subtle. The games that demand a decision tend to charge the least, and the games that ask for nothing tend to charge the most.
Does strategy reduce the house edge?
Sometimes, but only in games where the player’s choices change the outcome. Blackjack is the headline case: the correct basic strategy drops the edge from a careless 2%+ to about 0.5%, the single biggest improvement a casino player can give themselves for the price of memorizing a chart. But in the long run, the house always wins.
Video poker behaves the same way, rewarding precise play and punishing guesswork, but the good news end about here. Roulette, slots, keno and baccarat beyond the choice of bet are games of independent events. No betting system works. Hot streak or doubling-up scheme alters their house edge by a single decimal. Also, the Martingale does not work. It has never worked, and it never will. This logical fallacy merely empties a balance faster while lending the whole exercise a brief, convincing air of purpose.
FAQ
What is the house edge in blackjack?
About 0.5% when basic strategy is followed perfectly, which makes blackjack the lowest-edge table game in the building. Played carelessly, that edge can climb above 2%, so the figure rewards anyone who learns the correct play for every hand.
What casino game has the lowest house edge?
Full-pay video poker and blackjack share the lead at roughly 0.5% with optimal play, followed by the baccarat Banker bet at 1.06% and the craps pass line at 1.41%. The common thread is that all four reward correct decisions or sensible bet selection.
Can you beat the house edge?
Over the long run, almost no one does; the edge is precisely what guarantees the casino profits across millions of bets. Skilful blackjack and video poker play can shrink it to a fraction of a per cent, and individual sessions can certainly end in profit, but no betting system overcomes the underlying maths. The house wins by waiting.
Play responsibly
The house edge is a promise that, given enough time, the casino comes out ahead, which is the most important sentence in this entire guide. The remedy is to treat every game as paid entertainment rather than an income plan, and to set a deposit limit, a loss limit and a time limit before starting. OlyBet, a casino and sportsbook provider licensed in Estonia, provides those tools through OlySafe responsible gaming. The maths is fixed; how much exposure a player hands it is not.
