The mathematical advantage the casino has over players, expressed as a percentage of each bet.
House edge is the percentage of each wager that the casino expects to keep over time. It's the flip side of Return to Player (RTP) — if a game has a 2% house edge, the RTP is 98%.
House edge varies dramatically between games. Blackjack with basic strategy has a house edge as low as 0.5%, while some slot machines can exceed 10%. Understanding house edge helps you choose games that give you the best chance of winning.
Importantly, house edge applies over thousands of bets. In the short term, anything can happen — that's variance. But the longer you play, the closer your results will converge to the mathematical expectation.
European roulette has a 2.70% house edge from the single green zero. On a $10 bet on red, expected loss per spin = $10 × 0.027 = $0.27. Play 200 spins in an hour and your mathematical expectation is −$54, though variance guarantees sessions will swing far above or below that mean.
Compare to American roulette (double-zero): house edge jumps to 5.26%, nearly doubling expected loss to $1.05 per $10 spin. Blackjack with basic strategy runs 0.5%, single-deck 3:2 even lower. Picking games by house edge is the single biggest casino EV lever — it outweighs any betting system or hot-streak strategy by an order of magnitude.
House Edge = 100% - RTP<p>European roulette has a <strong>2.70% house edge</strong> from the single green zero. On a <strong>$10 bet on red</strong>, expected loss per spin = $10 × 0.027 = <strong>$0.27</strong>. Play 200 spins in an hour and your mathematical expectation is <strong>−$54</strong>, though variance guarantees sessions will swing far above or below that mean.</p><p>Compare to American roulette (double-zero): house edge jumps to <strong>5.26%</strong>, nearly doubling expected loss to $1.05 per $10 spin. Blackjack with basic strategy runs <strong>0.5%</strong>, single-deck 3:2 even lower. Picking games by house edge is the single biggest casino EV lever — it outweighs any betting system or hot-streak strategy by an order of magnitude.</p>
The mathematical advantage the casino has over players, expressed as a percentage of each bet.
House Edge = 100% - RTP
<p>European roulette has a <strong>2.70% house edge</strong> from the single green zero. On a <strong>$10 bet on red</strong>, expected loss per spin = $10 × 0.027 = <strong>$0.27</strong>. Play 200 spins in an hour and your mathematical expectation is <strong>−$54</strong>, though variance guarantees sessions will swing far above or below that mean.</p><p>Compare to American roulette (double-zero): house edge jumps to <strong>5.26%</strong>, nearly doubling expected loss to $1.05 per $10 spin. Blackjack with basic strategy runs <strong>0.5%</strong>, single-deck 3:2 even lower. Picking games by house edge is the single biggest casino EV lever — it outweighs any betting system or hot-streak strategy by an order of magnitude.</p>
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