Odds Calculator
Work out a bet's payout and implied probability from American, decimal, or fractional odds.
How to calculate a bet's payout
Every odds format describes the same thing: how much you win for what you risk. A $100 bet at +150 American odds profits $150, so a win pays back $250 in total, your stake plus the profit. The same price is 2.50 in decimal odds (multiply the stake by 2.50 for the total payout) and 3/2 in fractional odds (win $3 for every $2 staked).
Odds of +150 imply a 40.00% chance of winning, because 1 divided by 2.50 is 0.40. Type odds in whichever format your sportsbook shows; switching the format converts the value you entered.
Reading favorites and underdogs
Minus odds mean a favorite. At -110 you stake $110 to profit $100, the standard price on point spreads, which is 1.91 in decimal and 10/11 as a fraction. For a quick probability-only conversion, the odds to probability converter also works in reverse, from a chance to fair odds.
Frequently Asked Questions
What do plus and minus American odds mean?
Plus odds show the profit on a $100 bet, so +150 wins $150. Minus odds show how much you must bet to win $100, so -200 means a $200 bet profits $100. Plus odds mark the underdog and minus odds the favorite. Both include your stake back on a win.
What is implied probability?
It is the win chance the odds suggest, worked out as 1 divided by the decimal odds. Odds of 2.50 imply 40%. If you think the real chance is higher than the implied one, the bet has value; if lower, the price is against you.
Why do both sides of a bet add up to more than 100%?
That extra is the bookmaker's margin, often called the vig or juice. At -110 on both sides each side implies 52.38%, which adds up to 104.76%, so about 4.76% is built in for the book. Converting each side here shows how much margin a market carries.
Why does the fractional odds look slightly different from what I typed?
Fractional odds are shown in lowest terms with a denominator of 100 or less, so 6/4 appears as 3/2 and -110 appears as 10/11. When a decimal price has no exact small fraction, the calculator shows the closest one, so use the decimal figure for exact math.
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Turn odds into a probability and back again.