Odds Converter
Convert between decimal, fractional, American, and implied probability formats instantly.
Enter Odds
Decimal
2.50
American
+150
Fractional
3/2
Implied Probability
40.0%
Payout Calculator
Total Payout
$250.00
Profit
$150.00
Stake
$100.00
Understanding Odds Formats
Different regions and sportsbooks use different odds formats, but they all express the same thing: the probability of an outcome and the payout if you win. Decimal odds (used in Europe and Australia) show the total payout per dollar wagered. Fractional odds (used in the UK) show profit relative to stake. American odds (used in the US) show either how much you win on a $100 bet (positive) or how much you must bet to win $100 (negative).
Understanding all formats is essential for line shopping across different sportsbooks. A bet might look different in each format but have identical value. This converter lets you instantly translate between formats so you can compare odds from any source.
Implied probability is perhaps the most useful format for analytical bettors because it tells you the percentage chance the odds imply. If the implied probability is lower than your estimated true probability, you've found a value bet.
FAQ
What are decimal odds?
Decimal odds represent the total payout per unit wagered, including your stake. Odds of 2.50 mean you receive $2.50 for every $1 bet (profit of $1.50 plus your $1 stake). Decimal odds are the simplest format: multiply your bet by the odds to get your total payout.
How do American odds work?
Positive American odds (+150) show how much profit you make on a $100 bet. Negative odds (-200) show how much you must bet to win $100 profit. +150 means a $100 bet wins $150 profit. -200 means you need to bet $200 to win $100 profit.
How do you convert between odds formats?
Decimal to American: If decimal > 2.0, American = (decimal - 1) × 100. If decimal < 2.0, American = -100 / (decimal - 1). Decimal to implied probability: 1 / decimal × 100. Fractional to decimal: (numerator / denominator) + 1.
What is implied probability?
Implied probability converts odds into a percentage representing the likelihood of an outcome. Decimal 2.00 = 50% implied probability. American +200 = 33.3%. If you believe the true probability is higher than the implied probability, the bet has positive expected value.
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