American (Moneyline) Odds: The US Standard
American odds, also known as moneyline odds, are the predominant format used in the United States. These odds work differently for favorites and underdogs, making them unique among betting formats.
For Favorites (Negative Odds): When betting on a favorite, odds are displayed with a negative sign (-) showing how much money you must wager to win $100. For example, if the Kansas City Chiefs are listed at -760, you would need to bet $760 to win $100. Your total payout would be $860 ($760 original bet plus $100 profit).
For Underdogs (Positive Odds): Underdog odds feature a plus sign (+) indicating potential winnings for every $100 wagered. If the Pittsburgh Steelers are listed at +585, a $100 bet would return $585 in profit plus your original $100 stake, totaling $685.
The larger the spread between odds, the more significant the perceived difference in winning probability between competitors.
Fractional (British) Odds: The Traditional Format
Fractional odds, commonly used by British and Irish bookmakers, are expressed with a slash (/) or hyphen (-). This format shows the ratio of profit to stake.
How Fractional Odds Work:
- Odds of 6/1 (six-to-one) mean you win $6 for every $1 wagered
- A successful $10 bet at 6/1 returns $70 ($60 profit plus $10 stake)
- The formula for total payout is: Tp = S(N/D) + S, where Tp is total payout, S is stake, and N/D is the fractional odds
Practical Example: Consider these hypothetical NBA Finals odds:
- Miami Heat: 13/5
- Golden State Warriors: 9/2
- LA Lakers: 7/1
A $100 bet on Miami would return $360 total ($260 profit plus $100 stake). The same bet on Golden State would return $550 total, while betting on the Lakers would yield $800 total if successful.
Decimal (European) Odds: The Simplest Format
Decimal odds are widely considered the most straightforward format, popular in Europe, Australia, Canada, and New Zealand. The decimal number represents the total payout per dollar wagered, including your original stake.
Understanding Decimal Odds: The calculation is simple: Total Payout = Stake × Decimal Odds
Example from Esports: Using 2023 League of Legends World Championship odds:
A $100 bet on DRX returns $400 total ($300 profit plus $100 stake). The same bet on T1 returns $130 total ($30 profit plus $100 stake). Lower decimal odds indicate higher probability and lower risk.