Implied Probability Calculator
Convert American odds to implied probability. See the true win percentage the sportsbook is pricing into any line.
Enter Odds
What Is Implied Probability?
Implied probability is the win percentage that betting odds represent. Sportsbooks set odds based on their assessment of the likelihood of an outcome, plus their built-in margin (vig). Understanding implied probability helps you identify value bets — situations where you believe the true probability is higher than what the odds suggest.
The Formula
- Negative odds: Implied probability = |odds| / (|odds| + 100)
- Positive odds: Implied probability = 100 / (odds + 100)
Example
At -150 odds, the implied probability is 150 / (150 + 100) = 60%. The sportsbook is pricing this outcome at a 60% chance of winning. If you believe the true probability is higher — say 65% — then this is a +EV bet.
Get the Edge with Optimal Bet
Our app scans sportsbook pricing across the market to expose inefficiencies and uncover +EV edges. We compare odds, surface high-value opportunities, and deliver precision alerts so you can move with conviction.
