The Three Major Odds Formats
Different regions of the world use different odds formats. Understanding all three is essential for any bettor who wants to compare odds across international bookmakers.
Decimal Odds
Used across Europe, Australia, and most online sportsbooks. Decimal odds represent the total payout per unit staked, including your stake.
Example: Decimal odds of 2.50 mean a $10 bet returns $25 (profit of $15).
Calculation: Payout = Stake × Decimal Odds
Fractional Odds
Traditional in the UK and Ireland, particularly for horse racing. Fractional odds show the profit relative to the stake.
Example: 3/1 ("three to one") means you win $3 for every $1 staked, plus your stake back.
American Odds (Moneyline)
Standard in the United States. Positive odds (+150) show profit on a $100 stake. Negative odds (-200) show how much you need to stake to win $100.
Example: +150 means a $100 bet wins $150 profit. -200 means you bet $200 to win $100.
Converting Between Formats
- Decimal to Fractional: Subtract 1, then express as a fraction (2.50 → 3/2)
- Decimal to American: If > 2.0: (decimal - 1) × 100. If < 2.0: -100 / (decimal - 1)
- Implied Probability: 1 / decimal odds × 100%
Our odds converter tool handles all these conversions automatically.