The house edge is the casino's built-in mathematical advantage on every game — the percentage of every pound wagered that the casino expects to keep over the long run. Blackjack with perfect basic strategy has a house edge of 0.5%, making it the lowest-edge game in any casino. American Roulette has a house edge of 5.26%, making it one of the worst. This calculator shows you exactly where each game stands.

Select a game from the preset list (or enter custom win probability and payout), and the calculator returns RTP (return to player percentage), house edge, expected loss per £100 wagered, expected loss per hour (based on average hands/spins per hour), and the breakeven point. Most casino players underestimate how much house edge compounds — a 2% edge over 1,000 hands of blackjack costs about £200 in expected loss.

Game selection is the single biggest factor in your expected casino losses. Switching from slots (typically 4–8% house edge) to blackjack basic strategy (0.5%) reduces your expected losses by 80%+. For UK players specifically: live casino games often have a separate house edge from their RNG equivalents — check both before assuming. See our blackjack guide and roulette guide for the detailed strategies.