Odds Converter
Convert between fractional, decimal, and American odds. Calculate implied probability and potential payout.
Frequently Asked Questions
What are the different odds formats?
Fractional (UK): 5/1 means $5 profit per $1 stake. Decimal (EU): 6.0 means $6 total per $1 stake. American (US): +500 means $500 profit per $100 stake.
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What is this tool?
Betting odds converter transforms between different odds formats: decimal (European), fractional (British), American (moneyline), and implied probability. Helps bettors compare odds across bookmakers using different formats and calculate potential returns. Converts odds to implied probability to identify value bets where the true probability exceeds the implied probability.
How to use
- 1
Enter odds
Type the odds value.
- 2
Select format
Choose the input format (decimal/fractional/American).
- 3
View conversions
See all format equivalents and implied probability.
Frequently Asked Questions
How do American odds work?
Positive American odds (+150) show profit on a $100 bet ($150 profit). Negative American odds (-200) show how much to bet to win $100 (bet $200 to win $100). Formula: Positive = (odds/100) ร stake. Negative = (100/|odds|) ร stake. American odds center around -100/+100 (even money, equivalent to 2.0 decimal).
How to convert American to Decimal?
Positive American: Decimal equals American over 100 plus 1.
How do I calculate implied probability from odds?
Decimal: Probability = 1 / Decimal Odds ร 100%. For decimal odds of 2.50, implied probability = 1/2.50 ร 100% = 40%. Fractional: Probability = Denominator / (Numerator + Denominator) ร 100%. For 3/2 odds: 2/(3+2) ร 100% = 40%. American: Positive = 100/(Odds+100) ร 100%, Negative = |Odds|/(|Odds|+100) ร 100%. Note that implied probabilities across all outcomes typically sum above 100% due to the bookmaker margin.