Odds Converter and Implied Probability
American
Decimal
Fraction
Implied Probability
%
What it does
The odds converter converts between American, decimal and fractional odds and implied probability. Type in any box and the others update. It is the first step in converting a bonus bet to cash.
Profit on a $100 bet (+150), or the stake needed to win $100 (-150).
Total return per $1 bet, stake included.
Profit over stake: 3/2 wins $3 for every $2.
The win rate a price needs to break even, vig included.
How to use
Type the odds into any of the four boxes. Enter fractions as 5/2.
The other three boxes update as you type.
Worked example
+150 American
- Decimal
- 2.50
- Fractional
- 3/2
- Implied probability
- 40.00%
FAQ
How do I convert American odds to decimal?
Positive odds: divide by 100 and add 1, so +150 is 2.50. Negative odds: divide 100 by the odds without the minus sign and add 1, so -200 is 1.50.
How do American, decimal, and fractional odds relate?
They are three ways to write the same payout: decimal is the total return per $1, American is profit per $100 (or stake to win $100), and fractional is profit over stake.
What is implied probability?
The win rate a price needs to break even: 1 divided by the decimal odds. A 2.50 price implies 40%.
Why do implied probabilities across a market add up to more than 100%?
Every price includes the book's margin. The amount over 100% is the vig; the No Juice calculator removes it.
Which format should I use for betting math?
Decimal. EV, parlay and Kelly formulas all take decimal odds directly.