House Edge Explained
The single most important concept for any casino player. Understand how much each game really costs you.
Best Odds
Blackjack (0.5%)
Slots Average
3-6% Edge
Worst Odds
Keno (20-35%)
House Edge by Game
Best odds in the casino
Best odds with perfect play
Excellent for passive players
Great odds, fast action
Good odds, iconic game
Varies widely by game
Avoid — double zero kills odds
Worst odds in the casino
Why House Edge Matters
Over 1,000 bets of R100 each (R100,000 total wagered), a 1% house edge costs you R1,000 on average, while a 5% edge costs R5,000. Choosing lower house edge games literally saves you money.
This is why informed players favour blackjack and baccarat over slots and keno. The entertainment value of slots is undeniable, but from a pure mathematics perspective, table games offer significantly better odds for your bankroll.
House Edge vs Session Variance
House edge is a long-term mathematical average. In any single session, your results will vary significantly from the expected value. This is called variance (or volatility in slots).
High-variance games can produce big wins or big losses in short sessions, even with a low house edge. Low-variance games produce results closer to the expected house edge. Understanding this distinction is crucial for managing expectations and bankroll.
Frequently Asked Questions
Written by
James Mokoena
Casino & Betting Experts
James breaks down casino mathematics to help SA players make more informed gambling decisions.
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