Casino basics
What Is the House Edge in Gambling?
6 min read · Updated 2026 · 18+
The house edge is why casinos always win in the long run - and why some games cost you far more than others. Understand it and you instantly become a smarter player.
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The house edge is the average percentage of each bet the casino expects to keep over the long run. If a game has a 1% house edge, you can expect to lose, on average, $1 for every $100 wagered - not on any single bet, but across thousands of them. It is the built-in margin that guarantees the casino profits over time, even though individual players win all the time.
Why the casino always wins (eventually)
Every casino bet pays out slightly less than its true mathematical odds. Roulette is the classic example: a single number hits 1 in 37 times on a European wheel, but pays only 35 to 1 instead of 36 to 1. That small shortfall, repeated across millions of bets, is the casino's edge. The more you play, the closer your results track the edge - this is the law of large numbers working for the house.
House edge by game
The differences are huge. Blackjack with correct basic strategy can be as low as 0.5%. Baccarat (banker bet) is about 1.06%, and European roulette 2.7%. Most slots run a 2-6% edge depending on RTP. American roulette is 5.26%, and some side bets and keno-style games carry edges of 10% or more. Choosing low-edge games is the single biggest lever a player controls.
House edge vs RTP vs volatility
House edge and RTP are the same idea inverted: a 96% RTP slot has a 4% house edge. Volatility is separate - it describes the size and frequency of swings around that edge. A low edge means you lose slowly on average; low volatility means you lose smoothly. The two together determine how long your bankroll lasts.
How to play against the edge
You cannot eliminate the house edge, but you can minimise it: pick low-edge games (blackjack, baccarat, single-zero roulette, high-RTP slots), learn basic strategy where skill matters, avoid high-edge side bets, and use rakeback or cashback to claw back part of the margin. Then set a budget and treat the edge as the price of entertainment - because over a long enough horizon, that is exactly what it is.
Frequently asked questions
What does house edge mean?
It is the average percentage of each bet the casino expects to keep over the long run. A 2% house edge means you lose about $2 per $100 wagered on average across many bets.
Which casino game has the lowest house edge?
Blackjack with correct basic strategy (often around 0.5%) has the lowest edge, followed by baccarat's banker bet (about 1.06%) and single-zero roulette (2.7%).
Can you beat the house edge?
Not in the long run for games of pure chance. You can reduce it by choosing low-edge games and optimal strategy, and recover part of it via rakeback, but the edge always favours the casino over time.
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