Implied Probability Calculator

Implied probability is the win percentage that the odds suggest. It's calculated as 1 / decimal odds. For example, −200 American odds (1.50 decimal) imply a 66.7% chance of winning. It includes the bookmaker's margin, so the "true" probability is slightly lower.

It lets you compare what the sportsbook thinks vs. what you think. If you believe a team has a 60% chance to win but the implied probability is only 50%, that's a value bet. Finding spots where your estimated probability exceeds the implied probability is the foundation of profitable betting.

Because of the vig (juice). The sportsbook inflates both sides so the implied probabilities sum to more than 100% — typically 103–108% for a two-way market. The excess is the book's built-in profit margin.