What the house edge actually is — and what it doesn’t mean
The “house edge” is the casino’s built-in mathematical advantage on every bet. It’s expressed as a percentage and tells you, over many bets, what proportion of your total wagered amount the casino keeps on average. A 2% house edge means that across thousands of bets, the casino retains 2% of total amount wagered. The remaining 98% returns to players collectively, distributed unevenly as wins and losses across many sessions.
Most affiliate guides on this topic make the house edge sound either smaller or more beatable than it actually is. The honest reality: the house edge is mathematically unavoidable. No strategy, system, or pattern recognition technique eliminates it. What strategy can do is reduce it — moving you from games or bet types with high edges (slots at 4-8%, keno at 20-30%) to games or bet types with low edges (full-pay video poker at 0.5%, blackjack with basic strategy at 0.4-0.5%). That reduction matters, but the edge always remains positive in the casino’s favour.
This guide explains how house edge works mechanically, walks through real figures for each major casino game (with corrections to commonly-quoted but inaccurate numbers), and covers what house edge means for your actual bankroll over a session. We’ve kept the explanation tight and the math honest. By the end, you’ll understand exactly what you’re up against at any casino table.
How house edge works
The house edge comes from a specific mathematical mismatch: payouts are structured as if certain outcomes were less likely than they actually are. The casino takes the gap as profit.
The roulette example
European roulette has 37 pockets — numbers 1 through 36 plus a single zero. A straight-up bet on any single number pays 35:1 when it wins. The true odds of hitting are 1 in 37, which would warrant a 36:1 payout for a fair game. The 1/37 gap is the house edge: 2.70% on every single bet type on the wheel.
For American roulette, an extra double-zero pocket means 38 pockets. The straight-up bet still pays 35:1, but true odds are 1 in 38 (would need 37:1 to be fair). The house edge calculates to 5.26% — nearly double the European rate. This is why European is always the better choice when available.
The slot machine example
A slot’s RTP (Return to Player) is set by the game provider and audited by certifiers. A 96% RTP slot returns €96 of every €100 wagered on average — the remaining 4% is the house edge. The mathematics is built into the symbol weighting and payout schedules: the probability of each winning combination is set so the long-run return equals the stated RTP.
What house edge isn’t
A 2.70% house edge doesn’t mean you lose €2.70 every spin or that 2.70% of spins lose. It’s the long-run average across thousands of spins. Any single session can deviate dramatically — winning hundreds of euros or losing them — due to variance. The house edge only emerges as the result of many bets over a long period.
This is why casinos profit reliably while individual players sometimes win sessions. The casino aggregates across millions of bets from millions of players; the math plays out at that scale. Individual players experience the variance, not the long-run average.
Why players lose more than they expect
A common misconception about house edge: players think a 2% edge on €100 means losing €2. The actual math is much harsher.
The house edge applies to total amount wagered, not deposit amount. Across a typical session, your money cycles many times — you bet, win some back, bet again, win some back, and so on. By the time the bankroll runs out, you’ve wagered far more than your initial deposit.
A concrete example
Deposit: €100 at a slot with 96% RTP (4% house edge).
You bet €1 per spin. Each spin returns 96 cents on average — so you slowly lose. The bankroll depletes over many spins as the 4% edge grinds it down.
Expected total amount wagered before bankroll depletes: roughly €2,500 (your €100 multiplied through many cycles of winning some back and rebetting).
Expected total loss: 4% × €2,500 = €100 — your full deposit.
This is why “I’m playing with a 4% house edge so I should lose €4” misunderstands the math entirely. The €4 is the loss per €100 wagered; you’ll wager far more than €100 from a €100 deposit.
Time on machine matters
The longer you play, the more your total wagered grows, and the more the house edge plays out. A €100 deposit can last 30 minutes or 5 hours depending on your bet size and the game’s volatility. Longer sessions mean more total wagering, which means more total expected loss — and a higher probability that your actual result approaches the mathematical expectation.
Walking away during winning streaks is the only practical way to keep wins. Continuing exposes them to inevitable variance back toward expected loss.
House edge by game — verified figures
The actual numbers, with sources verified rather than rounded for marketing purposes.
Video poker (lowest with optimal strategy)
| Variant | House edge |
| Full Pay Deuces Wild (NSUD paytable) | -0.76% (player edge) |
| Full Pay Jacks or Better (9/6) | 0.46% |
| Bonus Poker (8/5) | 0.83% |
| Common Jacks or Better (8/5) | 2.70% |
| Common Jacks or Better (7/5) | 3.85% |
Video poker has the lowest house edge in any casino game when played at full-pay tables with optimal strategy. The paytable determines almost everything — “Jacks or Better” with a 9/6 paytable has a 0.46% house edge; the same name with 8/5 jumps to 2.70%. Casual play (without strategy charts) drops the effective return by 1-4% regardless of paytable.
Blackjack (low with basic strategy)
| Variant | House edge |
| Single Deck Blackjack (S17, 3:2) | 0.15% |
| Blackjack Switch (optimal switching) | 0.17% |
| Vegas Strip Blackjack (4-deck, S17) | 0.35% |
| Atlantic City Blackjack (S17, late surrender) | 0.36% |
| Classic 6-deck (S17, late surrender) | 0.45% |
| Classic 6-deck (H17, no surrender) | 0.70% |
| 6:5 blackjack (any variant) | ~1.90% |
These figures require basic strategy. Untrained play at the same tables runs a house edge of 2-4% because of strategy mistakes. 6:5 blackjack tables are a trap — that single rule adds 1.4% to house edge, more than the entire reduction from random play to perfect strategy. Always play 3:2 blackjack, never 6:5.
Baccarat (consistent, simple)
| Bet | House edge |
| Banker bet (with 5% commission) | 1.06% |
| Player bet | 1.24% |
| Tie bet (8:1 payout) | 14.36% |
| Tie bet (9:1 payout, rare) | 4.84% |
Always bet Banker. The 5% commission is already factored into the 1.06% house edge. The Tie bet is one of the worst bets in any casino — never take it. No baccarat bet has 100% RTP regardless of how affiliate pages frame “well-played” baccarat; the best you can do is the Banker bet at 1.06% house edge.
Roulette (variant matters most)
| Variant | House edge |
| French Roulette with La Partage (even-money bets) | 1.35% |
| European Roulette (all bets) | 2.70% |
| American Roulette (all bets) | 5.26% |
| American five-bet (0-00-1-2-3) | 7.89% |
| Mini Roulette | 7.69% |
French roulette with La Partage cuts the house edge on even-money bets in half compared to European. American is nearly twice the house edge of European — there’s no reason to play American when European is available. See our How to Win at Roulette page for the full discussion.
Craps (widest range of any game)
| Bet | House edge |
| Pass line + 10x odds | 0.18% |
| Pass line + 3x odds | 0.47% |
| Pass line (no odds) | 1.41% |
| Don’t Pass | 1.36% |
| Place bet 6 or 8 | 1.52% |
| Field bet | 5.56% |
| Hard 4 or 10 | 11.11% |
| Any 7 | 16.67% |
Craps has the widest house edge range of any casino game — from 0.18% on pass line with maximum odds to 16.67% on Any 7. Pass line + maximum odds is the optimal strategy. The proposition bets and hardways look attractive but have catastrophic house edges.
Slots (wide range)
| Slot category | House edge |
| Top high-RTP slots (Mega Joker, Blood Suckers) | 1-2% |
| Standard quality slots (Book of Dead, Starburst) | 3-4% |
| Average online slots | 4-6% |
| Vegas physical penny slots | 8-12% |
| Progressive jackpot slots | 5-12% |
Slot house edges vary enormously. The highest-RTP online slots have edges around 1-2%; average slots run 4-6%; Vegas physical penny slots and many progressive jackpots run higher. The RTP is set by the provider and displayed in the game info panel at reputable casinos — always check before playing.
Picking high-RTP slots is the only meaningful “strategy” available. Maximum paylines doesn’t reduce the per-euro house edge; it just increases total amount wagered, which means more total expected loss. The advice to “play maximum paylines to beat slots” is misleading — it makes you bet more, not win more per euro.
High house edge games to avoid
- Keno: 20-35% house edge depending on the casino. Among the worst in any casino.
- Scratch cards: 10-30% house edge depending on the game.
- Bingo: 20-40% house edge depending on format and prize structure.
- Wheel of Fortune-style games: 11-25% house edge.
These games have higher house edges because they appeal to casual players who don’t compare math. The lottery falls in the same category at typical 50%+ house edge.
What reduces the house edge
Several factors genuinely reduce the casino’s edge. Not betting systems, not “hot streaks” — these are real mathematical levers.
Strategy and skill
Blackjack basic strategy moves the house edge from 2-4% (untrained play) to 0.4-0.5% (optimal play). Video poker optimal strategy similarly moves the edge from 4% (untrained) to 0.5% (perfect play). The strategy is documented, learnable, and applies to every hand.
For games without skill components (roulette, baccarat, slots, craps proposition bets), strategy can’t help. The edge is fixed by the game’s design.
Variant and rule selection
Choosing European roulette over American halves the house edge. Choosing French roulette with La Partage halves it again on even-money bets. Choosing blackjack tables with S17 (dealer stands on soft 17), 3:2 blackjack payouts, late surrender, and double after split produces a lower house edge than tables without these rules.
These are the largest single edge reductions available to most players. Always check the rules before sitting down.
Bet type selection
Within a single game, bet types can have wildly different house edges. Baccarat banker bet is 1.06%; tie bet is 14.36%. Craps pass line is 1.41%; Any 7 is 16.67%. Selecting the lowest-edge bet within each game matters enormously.
Game selection itself
The single biggest lever: choose games with low house edges. Video poker (0.46% with full pay), blackjack (0.4-0.5% with basic strategy), baccarat banker (1.06%), and French roulette with La Partage on even-money bets (1.35%) all beat average slots (4-6%) by 8-15x in expected return per euro wagered.
What doesn’t reduce the house edge
- Betting systems: Martingale, Paroli, Fibonacci, D’Alembert — all redistribute variance but leave expected value unchanged
- Pattern recognition: Hot/cold numbers, “due” outcomes — gambler’s fallacy
- Casino loyalty programmes: Slight rebate on losses; doesn’t change the base game’s math
- Lucky charms, superstitions, “feel”: Zero mathematical effect
Common misconceptions about house edge
A few recurring confusions that affect even informed players.
“The casino sets the house edge.” No. House edge is set by the game’s mathematical design — the wheel layout for roulette, the paytable for slots, the deck composition for blackjack. Casinos can sometimes choose between different RTP versions of a slot (e.g. 92%, 94%, 96% versions exist for some games), but they don’t adjust the edge within a version. The provider sets it; certifiers verify it.
“Casinos pump oxygen to keep players awake.” Debunked myth. Casinos don’t do this — it would be a fire hazard and is illegal in most jurisdictions. Casinos keep players in through atmosphere (no clocks, low ceilings, controlled lighting), free drinks, and entertainment — not pumped oxygen. The myth persists because it’s a memorable image; the reality is more mundane.
“Playing more paylines beats the slot.” No. Playing maximum paylines maximises your chance of any single spin winning something, but it also increases your total wagered per spin proportionally. The house edge per euro wagered stays the same. You’re not getting better odds; you’re just betting more per spin.
“Maximum bet on video poker gives better RTP.” Partially true with a specific caveat. Max-coin (5 coins) bets on most video poker variants qualify for the full royal flush payout (4,000 coins). At less than max coin, the royal flush often pays a smaller proportional amount, slightly reducing RTP. But max bet doesn’t change RTP outside the royal flush mechanic — the broader claim that “betting bigger reduces house edge” is wrong.
“Online casinos have higher house edges than physical casinos.” Generally false. Online operators have lower overhead, so online RTPs are typically slightly better than physical equivalents (96-98% online vs 92-95% physical for slots, similar gaps for table games).
“A 99% RTP slot means I’ll win 99% of the time.” No. RTP describes the long-run return rate (what fraction of total wagered returns to players collectively), not win frequency. A 99% RTP slot can still have only 20-30% of spins resulting in wins — most wins are small, while the occasional large win provides the rest of the return.
House edge in practice — what it means for your session
Practical math for typical session scenarios at different house edge levels.
At 0.5% house edge (blackjack basic strategy, full-pay video poker)
Bet €10 per hand, 60 hands/hour, €600 wagered per hour. Expected loss: 0.5% × €600 = €3/hour. Session of 2 hours: €6 expected loss.
This is the best you can do at major casino games. The €6 expected loss across 2 hours is genuinely modest — comparable to the cost of a cup of coffee.
At 1.06% house edge (baccarat banker bet)
Bet €10 per round, 70 rounds/hour, €700 wagered per hour. Expected loss: 1.06% × €700 = €7.42/hour. Session of 2 hours: €14.84 expected loss.
Slightly worse than blackjack but no strategy required. Reasonable cost for the entertainment.
At 2.70% house edge (European roulette)
Bet €10 per spin, 50 spins/hour, €500 wagered per hour. Expected loss: 2.70% × €500 = €13.50/hour. Session of 2 hours: €27 expected loss.
Mid-range. Most players’ default casino experience.
At 5% house edge (average slots)
Bet €1 per spin, 600 spins/hour, €600 wagered per hour. Expected loss: 5% × €600 = €30/hour. Session of 2 hours: €60 expected loss.
The faster pace of slots means more total wagering per hour, which compounds with the higher per-bet edge. Slots burn through bankrolls fast.
At 20% house edge (keno)
Bet €1 per round, 30 rounds/hour, €30 wagered per hour. Expected loss: 20% × €30 = €6/hour. Session of 2 hours: €12 expected loss.
Looks modest in absolute terms, but only because of the slow pace. Per euro wagered, you’re losing 40x faster than at blackjack.
What these numbers tell you
Same hour of play, very different expected losses depending on game choice. €6 at blackjack basic strategy vs €60 at average slots — 10x difference for the same time investment. This is why game selection matters more than any betting system.
For comparable entertainment, choosing low-house-edge games stretches your bankroll significantly. Variance still produces winning sessions in any game, but the long-run expected cost varies by 10-20x across the casino floor.
Frequently Asked Questions
What is the house edge?
The house edge is the casino’s built-in mathematical advantage on every bet, expressed as a percentage of total amount wagered. A 2% house edge means the casino retains 2% of total bets on average across many bets. The remaining 98% returns to players collectively, distributed as wins and losses unevenly across sessions.
Which casino game has the lowest house edge?
Full-pay video poker at 0.46% (Jacks or Better 9/6) or theoretically negative (Full Pay Deuces Wild NSUD at -0.76%). Blackjack with basic strategy at good-rule tables is comparable at 0.15-0.45%. Pass line + maximum odds in craps reaches 0.18%. These are the lowest house edges available in any casino game.
Which casino game has the highest house edge?
Keno (20-35%), scratch cards (10-30% depending on game), bingo (20-40%), and the lottery (50%+) are at the top. Within standard table games, the baccarat tie bet (14.36%), craps Any 7 (16.67%), and the American roulette five-bet (7.89%) are the worst bets.
Can I beat the house edge?
Not consistently long-term. The house edge is mathematically unavoidable across many bets — variance produces winning sessions, but expected value remains negative. You can reduce the edge significantly through game selection, variant choice, and strategy, but the edge always remains positive in the casino’s favour.
Does the casino set the house edge?
No. The house edge is set by the game’s mathematical design and verified by certifiers. Casinos can sometimes choose between different RTP versions of a slot (e.g. 92%, 94%, 96% available for some games), but they don’t adjust within a version. The provider determines it; auditors verify it.
Is online house edge different from physical casino house edge?
Generally yes — online is slightly lower because of lower operator overhead. Slot RTPs typically run 96-98% online vs 92-95% at physical casinos. Table game edges are similar (within 0.1-0.3% on identical rules). For most games, online offers slightly better expected returns.
What’s the difference between house edge and RTP?
They’re inverses of each other. RTP (Return to Player) is the percentage that returns to players; house edge is the percentage the casino keeps. A 96% RTP slot has a 4% house edge. They describe the same thing from opposite perspectives.
Does the house edge apply to my deposit or total bets?
Total amount wagered, not deposit. Most players cycle their money through many bets over a session — winning some back, betting again, and so on. The total wagered is typically 3-10x the deposit amount before the bankroll depletes. The house edge applies to all that total wagering, which is why expected losses are larger than naive calculations suggest.
Can I reduce the house edge?
Yes, through several legitimate levers: choose games with lower base edges (video poker, blackjack), select favourable variants (European/French roulette over American), apply optimal strategy where applicable (blackjack basic strategy, video poker hold strategy), and pick the right bets within games (baccarat banker over tie, craps pass + odds over propositions). What you cannot do is eliminate the edge through betting systems, pattern recognition, or any other “system.”
Why do casinos make profit if the house edge is so small?
The house edge applies to millions of bets across millions of players. Even a 1% edge generates substantial profit at that scale. A casino taking €100 million in total wagering per year at average 4% house edge profits €4 million from that volume alone. Individual players experience variance; casinos experience the long-run mathematical expectation.
