Betting calculatorOdds and probability
Sports Betting Implied Probability Calculator
Convert American odds into implied win probability and decimal odds.
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- Runs in your browser
Convert odds to probability
Calculation result
Example inputsEnter the example values to calculate a result.
How it works
What implied probability tells you
Implied probability is the win percentage associated with a price at break-even. It lets you translate American odds into a probability that is easier to compare with a forecast. The quoted percentage includes sportsbook margin unless you remove the vig across all outcomes.
At -150, a bettor risks $150 to win $100, so the break-even probability is 150 ÷ (150 + 100), or 60%. At +150, the break-even probability is 100 ÷ (150 + 100), or 40%.
American odds probability formula
For positive American odds A, implied probability is 100 ÷ (A + 100). For negative odds −A, use A ÷ (A + 100). Decimal odds are 1 plus the implied profit per unit staked and make it easier to combine prices.
The calculator also shows decimal odds so you can compare a US price with decimal or fractional formats without changing the underlying payout.
Separate break-even chance from true chance
A 60% break-even probability does not mean an event has a 60% chance of occurring. It means a bettor would need to win 60% of equal-sized wagers at that price to break even before accounting for pushes, taxes, or bonuses. Compare the number with a credible independent probability estimate.
Frequently asked questions
How do you convert -110 odds to implied probability?
For negative American odds, divide the absolute odds by the absolute odds plus 100. At -110, that is 110 ÷ 210, or about 52.38%.
Do implied odds include the vig?
Yes. A single side’s implied probability is calculated from the listed price, which usually includes the sportsbook’s margin. Remove the vig using all outcomes in the market.
What is the difference between implied probability and win probability?
Implied probability is the break-even rate associated with the price. Win probability is an estimate of how likely the outcome actually is. They can differ.