House Edge Explained: How Casinos Really Make Money

## What Is the House Edge? The house edge is the mathematical advantage that a casino holds over players in every game. It's not a scam or a trick—it's how casinos stay in business. Think of it this way: if you and the casino flip a coin, you'd expect to win 50% of the time. But the casino pays you slightly less than fair odds when you win. That gap between true odds and payout odds is the house edge. **Simple example:** You bet $1 on a coin flip. True odds would pay $2 on a win. But the casino pays $1.90. That 10-cent difference, over thousands of flips, is how they profit. --- ## How the House Edge Is Calculated The formula is straightforward: **House Edge = (Total Bets - Total Payouts) ÷ Total Bets × 100** Or more simply: **House Edge = 100% - RTP** RTP (Return to Player) is the percentage a game pays back over time. If a slot has 96% RTP, it has a 4% house edge. For every $100 wagered, the casino expects to keep $4 on average. ### Important Clarification This doesn't mean you lose $4 every time you bet $100. In any single session, you might win big or lose everything. The house edge is a **long-term statistical average** calculated over millions of bets. In the short term, anything can happen. That's what makes gambling exciting—and risky. --- ## House Edge by Game Type Different games have vastly different house edges. This matters for your bankroll. ### Skill-Based Games (Lower House Edge) | Game | Typical House Edge | Notes | |------|-------------------|-------| | [Blackjack](/games/blackjack) | 0.5% - 2% | Optimal strategy required | | [Baccarat](/games/baccarat) | 1.06% - 1.24% | Banker bet is best | | Video Poker | 0.5% - 5% | Depends on paytable | | Craps (Pass/Don't Pass) | 1.36% - 1.41% | Basic bets only | These games reward knowledge and proper strategy. A blackjack player using basic strategy faces roughly 0.5% house edge—one of the lowest in any casino. ### Luck-Based Games (Higher House Edge) | Game | Typical House Edge | Notes | |------|-------------------|-------| | [Roulette](/games/roulette) (European) | 2.7% | Single zero | | [Roulette](/games/roulette) (American) | 5.26% | Double zero adds edge | | Slots | 2% - 15% | Varies widely | | Keno | 25% - 40% | Among the highest | | [Crash](/games/crash) | 1% - 5% | Depends on casino | | [Dice](/games/dice) | 1% - 2% | Crypto casino standard | | [Mines](/games/mines) | 1% - 5% | Risk level dependent | | [Plinko](/games/plinko) | 1% - 4% | Varies by configuration | **Key insight:** The games with the biggest potential payouts often have the highest house edges. Keno can pay 100,000x your bet—but the house takes 25-40% over time. --- ## How the House Edge Affects Your Bankroll Understanding house edge helps you calculate expected losses over time. ### Expected Loss Formula **Expected Loss = Total Wagered × House Edge** Example: You play [roulette](/games/roulette) for 4 hours, betting $10 per spin, 40 spins per hour. - Total wagered: $10 × 40 × 4 = $1,600 - European roulette house ed