Betting Odds Converter
Convert between decimal, fractional, and American moneyline odds with implied probability and payout calculation.
Did this tool work for you?
How to use this calculator
All odds are converted through decimal format as a common base. Implied probability is the inverse of decimal odds expressed as a percentage.
- 1
Select the odds format your sportsbook displays.
- 2
Enter the odds value (e.g. 2.50, 3/2, or +150).
- 3
Enter your stake amount.
- 4
Read the converted odds in all three formats, the implied probability, and your potential payout.
Frequently asked questions
What are decimal odds?
Decimal odds (common in Australia, Europe, and Canada) show your total return per unit staked, including your stake. Odds of 2.50 mean you get $2.50 back for every $1 wagered — a profit of $1.50. They are the easiest format for calculating payouts.
How do fractional odds work?
Fractional odds (traditional in the UK) show profit relative to stake. Odds of 3/2 mean you profit $3 for every $2 staked. They are equivalent to decimal odds of 2.50.
What does +150 mean in American odds?
Positive American odds show the profit from a $100 stake. +150 means you profit $150 on a $100 bet (total return $250). Negative odds show how much you must stake to profit $100: −200 means stake $200 to profit $100.
Betting Odds Converter — Decimal, Fractional & American
Understanding the Three Odds Formats
Decimal odds are popular in Australia, Europe, and Canada. Fractional odds are traditional in the UK and Ireland. American (moneyline) odds are standard in the United States. All three express the same probability — this converter lets you work in whichever format your bookmaker uses.
Implied Probability and Bookmaker Margin
Implied probability is what the odds suggest the chance of the outcome is. If you add the implied probabilities of all outcomes in a market, the total exceeds 100% — the excess is the bookmaker's margin (overround or vig), typically 2–10%.
Finding Value in Betting Markets
A value bet exists when your estimated probability of an outcome exceeds the implied probability in the odds. For example, if you believe a team has a 60% chance of winning but the odds imply only 50%, the bet offers positive expected value.
Learn more from an authoritative source:
WikipediaGolf Handicap Calculator
Calculate your golf handicap index from recent scores using the World Handicap System formula.
Cricket Run Rate Calculator
Calculate current run rate, required run rate, and match projections for cricket innings.
Fantasy Sports Points Calculator
Calculate fantasy sports points for cricket, NFL, soccer, or basketball based on player performance stats.
Parlay Payout Calculator
Calculate potential parlay payout from multiple betting selections (legs) using decimal odds.
Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →