Casino Glossary

The mathematical advantage that the casino maintains over players in any given game. Expressed as a percentage, house edge represents the average amount of each bet that the casino expects to retain over time. For example, a game with a 2% house edge means the casino expects to keep $2 for every $100 wagered. Understanding house edge is crucial for evaluating game fairness and making informed decisions about which games to play.

The percentage of all wagered money that a game is designed to pay back to players over time. RTP is the inverse of house edge. A game with an RTP of 96% has a 4% house edge. This metric is calculated over thousands or millions of spins or hands, so individual sessions may vary significantly from the theoretical RTP.

The likelihood of a specific event occurring, expressed as a number between 0 and 1, or as a percentage. In casino games, probability determines the chances of winning or losing. For instance, a single die has a 1 in 6 probability of landing on any specific number. Understanding probability helps players appreciate why certain outcomes are more or less likely than others.

The ratio expressing the relationship between probability and payout. Odds can be presented in various formats: decimal odds show the total return including the original stake, fractional odds show the profit relative to the stake, and moneyline odds indicate the amount needed to win $100 or the amount won from a $100 bet. True odds represent the actual mathematical probability, while house odds include the casino's edge.

A statistical measure of volatility or variance in game outcomes. Higher standard deviation means results fluctuate more widely from the average, creating larger winning and losing streaks. Lower standard deviation means more consistent, stable results. This concept helps players understand how much their actual results might deviate from theoretical expectations over short playing sessions.

The average amount a player can expect to win or lose per bet over the long term. Calculated by multiplying each possible outcome by its probability and summing the results, EV represents the mathematical expectation of a wager. A negative EV means the game favors the house; a positive EV would favor the player. Most casino games have negative EV for players.

The measure of how much actual results differ from the expected mathematical average. High variance games can produce significant short-term swings in either direction. Low variance games provide more consistent, predictable results. Understanding variance helps players manage expectations and bankroll appropriately for their chosen games.

Similar to variance, volatility describes the degree of fluctuation in game outcomes. High volatility games offer the possibility of larger wins but also larger losses. Low volatility games provide smaller but more frequent wins. This distinction is important for matching your playing style and bankroll to appropriate games.