Definition
Odds are a numerical expression representing the likelihood of an event occurring. In gambling, “odds” can refer to two different things: Probability (the mathematical chance of winning) and Payout Odds (how much the casino will pay you if you win). The difference between these two numbers is where the casino makes its profit.
In context
On a standard European Roulette wheel, the True Odds of hitting the number 17 are 36 to 1 (there are 37 total pockets). However, the casino offers Payout Odds of 35 to 1. If you bet $1 and win, you receive $35 plus your original $1. The “missing” unit in the payout is the house edge.
Why it matters
Understanding odds is the most fundamental skill in gambling. It allows a player to calculate whether a bet is “fair” or “sucker” territory. If you don’t know the difference between the chance of an event happening and what you are being paid for it, you cannot understand the “cost” of the game you are playing.
Related terms
In detail
“Odds” is a word used loosely in casinos, but in the back office, it has a very precise meaning. To gamble effectively, you must distinguish between the Math (True Odds) and the Money (Payout Odds).
True Odds vs. Payout Odds
This is the single most important concept in a casino.
- True Odds: The actual physical probability of an event. For a six-sided die, the true odds of hitting a “6” are 5 to 1 (five ways to lose, one way to win).
- Payout Odds: The ratio the casino uses to pay you. For that same die, a casino might only pay you 4 to 1.
The gap between “5 to 1” and “4 to 1” is the House Edge. The casino isn’t “beating” you because they are lucky; they are beating you because they are underpaying you relative to the actual risk you are taking.
Different Ways to Express Odds
Depending on where you are in the world or what game you are playing, odds can be written in three different ways:
- Fractional Odds (Common in UK/Horse Racing): Written as 5/1 or “5 to 1.” This means for every $1 you bet, you win $5.
- Decimal Odds (Common in Europe/Australia): Written as 6.00. This includes your original stake. If you bet $1 at 6.00, you get back $6 total ($5 profit + $1 stake).
- American Odds (Moneyline): Written with a plus or minus sign (e.g., +500).
- +500 means you win $500 for every $100 bet.
- -200 means you must bet $200 to win $100.
Odds in Table Games: Examples
- Craps: Craps is famous for offering “True Odds” on the “Odds Bet” (the bet you place behind the Pass Line). This is the only bet in the casino where the payout odds exactly match the true odds, meaning the house has 0% edge on that specific portion of your money.
- Blackjack: A “Natural” pays 3 to 2 odds. For a $10 bet, you win $15. If the table pays 6 to 5, you only win $12. The “odds” of getting the blackjack haven’t changed, but the “payout odds” have, which makes the 6:5 game much more expensive for the player.
- Baccarat: The Banker bet wins more often than the Player bet. To compensate for these “better odds” of winning, the casino takes a 5% commission on Banker wins. This is another way of adjusting the payout odds to ensure the house keeps its edge.
The “Odds” of the House Winning
When we say “the odds are in the house’s favor,” we are talking about the cumulative effect of thousands of bets. On any single hand of cards, the player has a decent chance of winning. However, as the number of trials increases, the “True Odds” become an immovable force.
In a game like Roulette, the house doesn’t win because the green “0” comes up all the time. They win because they have 38 numbers on the wheel but only pay you as if there were 36. Over time, that “missing” payout from every win adds up to a 5.26% profit for the casino.
Player Mistake: Confusing “Odds” with “History”
The biggest mistake players make is thinking that the “odds” change based on what happened recently. This is the Gambler’s Fallacy. If a coin has landed on Heads 10 times in a row, the “True Odds” of it landing on Heads on the 11th flip are still exactly 1 to 1 (50%). The wheel, the cards (in a fresh shoe), and the dice have no memory. The odds are a mathematical constant, unaffected by your “feeling” or the previous result.
Summary
If you want to be a smart player, always ask: “What are the true odds of this happening, and what is the casino paying me?” If the gap between those two numbers is large (like in Keno or some slot machines), you are paying a high price for your entertainment. If the gap is small (like in Blackjack or Craps), you are getting the “best odds” in the building.