Odds and Implied Probability Converter
Convert between American, decimal, and fractional odds and see the implied probability and break even win rate for any price. Use this tool to better understand what the odds at your sportsbook really mean.
This tool is for education and entertainment only. It does not place bets or guarantee outcomes. Always check final odds directly in your sportsbook app before wagering.
How to use this odds converter
Step 1: Choose the odds format you have
In the converter, select whether you are entering American, decimal, or fractional odds. This should match the format shown in your sportsbook or in the content you are reading.
Step 2: Enter the odds value
- For American odds, enter numbers like -110, -150, +120, or +250.
- For decimal odds, enter a number greater than 1, such as 1.91, 2.50, or 3.10.
- For fractional odds, enter a fraction like 5/2, 10/11, or 7/4.
Step 3: Review the converted formats
Once you enter valid odds, the converter will automatically fill in:
- Equivalent American odds
- Equivalent decimal odds
- Equivalent fractional odds
Step 4: Understand implied probability and break even
The converter also shows the implied probability of the odds and the break even win rate. This is the percentage of time a bet at those odds would need to win over the long run to break even before any vig, taxes, or promos.
Convert odds and see implied probability
Select the odds format you have, enter the value, and the converter will fill in the other formats and show the implied probability and break even win rate.
Type the odds as they appear at the book.
| Format | Value |
|---|---|
| American odds | – |
| Decimal odds | – |
| Fractional odds | – |
| Implied probability | – |
| Break even win rate | – |
Odds converter FAQ
Implied probability is the win rate suggested by the odds. If odds are fair, the implied probability tells you how often a bet would need to win for you to break even over time. Converting odds to a simple percentage can make it easier to think about value and long term results.
American odds use plus and minus numbers relative to a reference stake of one hundred dollars. Decimal odds show the total return per unit staked, including your stake. Fractional odds express the profit relative to stake as a fraction, such as five over two. All three formats represent the same underlying probability; they just display it in different ways.
The break even win rate tells you how often you would need to win at a given price to avoid losing money before fees and promotions. If you believe you can beat that percentage with your strategy over a large sample of bets, the odds might be attractive. If not, the price may not be worth taking.
The converter simply reads the odds as they are and shows the implied probability. Any vig or house edge that is already baked into those odds will be reflected in the implied percentage, but the tool does not try to guess what a fair no vig price would be. For that you would need a model or market comparison.
Yes. As long as you type in the current odds correctly, the converter will give you the implied probability in real time. This can be useful when live lines move quickly and you want to sanity check how aggressive a price really is.
The converter creates an approximate fraction that is close to the true decimal odds, then simplifies it. For common prices like plus one hundred fifty or minus one ten the fractional output will look familiar. For less common prices, the nearest simple fraction may be a little less intuitive, but it will still represent a similar price.