Betting Odds Converter
Convert between Decimal, Fractional, American, and Probability formats.
Understanding Betting Odds
Odds represent the probability of an event occurring and determine how much profit you will make on a winning wager. Different regions use different formats, but they all represent the same underlying mathematical probability.
1. Decimal Odds (European)
Decimal odds represent the total payout rather than just the profit. The formula is: Total Payout = Stake × Odds. For example, a $100 bet at 2.50 odds returns $250 ($150 profit + $100 original stake).
2. American Odds (Moneyline)
Common in the US, these are centered around $100. Positive numbers (+) indicate how much profit you win on a $100 stake. Negative numbers (-) indicate how much you must stake to win $100 profit.
3. Fractional Odds (British)
Common in the UK and horse racing, shown as 5/1 or 10/11. The first number is the profit you make relative to the second number (your stake). 5/1 means you win $5 profit for every $1 staked.
Conversion Examples
| Decimal | Fractional | American | Probability |
|---|---|---|---|
| 1.50 | 1/2 | -200 | 66.7% |
| 2.00 | 1/1 (Evens) | +100 | 50.0% |
| 3.00 | 2/1 | +200 | 33.3% |
How to Calculate Implied Probability
Implied probability is the conversion of betting odds into a percentage. It helps bettors identify "value" bets where the true probability is higher than the implied probability shown by the bookmaker.
Decimal Formula: (1 / Decimal Odds) × 100 = Implied Probability %