Betting Odds Converter: American, Decimal, and Fractional
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Different sportsbooks display odds in different formats. American odds are standard in the US, decimal odds dominate in Europe and Australia, and fractional odds are traditional in the UK. If you bet across multiple platforms or follow international sports, you need to convert between them.
Our odds converter does it instantly. Enter odds in any format, and you will see the equivalent in all three formats, plus the implied probability and what a $100 bet would pay.
How It Works
Select your input format (American, Decimal, or Fractional), enter the odds, and the converter handles the rest. You will see:
American Odds (e.g. -110, +150)
Decimal Odds (e.g. 1.91, 2.50)
Fractional Odds (e.g. 10/11, 3/2)
Implied Probability as a percentage
$100 Payout so you can quickly gauge the value
The conversion updates in real time as you type.
Understanding the Three Formats
American Odds
The most common format in US sportsbooks. Negative numbers (like -110) show how much you need to bet to win $100. Positive numbers (like +150) show how much you win on a $100 bet. The bigger the negative number, the heavier the favorite.
Decimal Odds
Popular outside the US. The number represents your total return per $1 wagered, including your stake. Decimal odds of 2.50 mean a $1 bet returns $2.50 ($1.50 profit + $1 stake). Anything above 2.00 is an underdog.
Fractional Odds
Traditional UK format. The fraction represents profit relative to stake. Odds of 3/2 mean you profit $3 for every $2 you bet. Odds of 1/2 mean you profit $1 for every $2 bet (a favorite).
Why Implied Probability Matters
Every set of odds implies a probability of that outcome happening. A -200 favorite has an implied probability of 66.7%. A +200 underdog implies 33.3%.
The value in sports betting comes from finding spots where you believe the true probability is higher than what the odds imply. If a team is +150 (implied 40%) but you think they win 50% of the time, that is a positive expected value bet.
