Odds Converter
Convert between American and decimal odds, and see the probability the price implies.
Results
- American odds
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- Decimal odds
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- Implied probability
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Both formats are always shown, including the one you entered, so you can check the calculator read your price the way you meant it. An American price shown with ≈ has been rounded to the nearest whole number, because that is how sportsbooks quote them — the decimal price and the probability are the exact figures.
These calculators are for information only. They perform arithmetic on the numbers you enter. They do not predict outcomes, recommend bets, or guarantee any result. Betting involves risk and you can lose money. Never stake more than you can afford to lose. Read our responsible betting guidance.
How to read betting odds
American odds show a price relative to $100:
- A plus price (+150) is the profit on a $100 stake. $100 at +150 wins $150.
- A minus price (−110) is the stake needed to win $100. $110 at −110 wins $100.
Decimal odds show the total return per 1 unit staked, stake included. At 2.50, a $10 stake returns $25.
Conversion formulas
- American to decimal, plus price: 1 + (odds ÷ 100). +150 → 2.500
- American to decimal, minus price: 1 + (100 ÷ |odds|). −110 → 1.909
- Decimal to American, 2.00 or more: (decimal − 1) × 100. 2.75 → +175
- Decimal to American, below 2.00: −100 ÷ (decimal − 1). 1.50 → −200
Implied probability
The implied probability is the break-even win rate a price represents:
- Plus price: 100 ÷ (odds + 100). +150 → 40.00%
- Minus price: |odds| ÷ (|odds| + 100). −110 → 52.38%
- Decimal: 1 ÷ decimal odds. 2.75 → 36.36%, 1.50 → 66.67%
Why both sides add up to more than 100%
When both sides of a game are priced −110, each implies 52.38%, for a total of 104.76%. The extra 4.76% is the sportsbook’s margin, often called the vig or juice. Implied probability is a property of the price. It is not a prediction of what will happen.
Odds questions
What does +100 or “even money” mean?
A $100 stake wins $100. In decimal odds that is 2.00, and it implies 50%.
Can I convert fractional odds?
Not in this tool yet. Fractional 3/2 is the same as 2.50 decimal and +150 American.
Does the converter store anything?
No. It runs in your browser.