Start here · Essential guide
The House Edge: A Comprehensive Guide to Casino Game Probability
A plain overview of the house edge: how probability and payouts combine to build a built-in advantage, and why it shows up reliably across many bets.
The Math
How the built-in house edge, odds and probability shape every casino game.
Start here · Essential guide
A plain overview of the house edge: how probability and payouts combine to build a built-in advantage, and why it shows up reliably across many bets.
How the gap between true odds and paid odds creates the casino's advantage, with simple worked examples showing how payout tables set the edge.
How to compute simple probabilities for dice, cards and roulette, and how to read odds quoted as fractions, ratios and percentages without being misled.
A general explanation of how outcome distributions look over many plays, why shapes differ between games, and what cannot be said without real data.
Why aggregate player results tend toward a loss, why some individual players still finish ahead, and what simply cannot be claimed without real data.
Hold percentage compares what a venue keeps with what players exchange or wager. Learn how it differs from the theoretical house edge and why the two rarely match.
House edge and return to player (RTP) are complements that add up to 100%. See how to convert between them and where the comparison needs care.
Think of the house edge as an expected cost per unit wagered. A simple hypothetical shows how that cost builds up over many bets, with results varying widely.
A reflective look at what chance, luck and randomness actually mean, and why people attribute meaning to outcomes that the underlying mechanisms do not carry.
Why independent events have no memory, why the gambler's fallacy is a probability error, and what the law of large numbers does and does not promise.
Theoretical loss is a long-run average. Learn why a single casino session can land far above or below it, using a hypothetical roulette example.
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