Sports Odds

The Cornerstone of Value Betting—Understanding Implied Probability

A sharp bettor’s primary goal is not to predict the winner, but to find value—situations where the sportsbook’s listed odds do not accurately reflect the true probability of an event. This starts with calculating Implied Probability (IP).

Odds FormatFormula for Implied ProbabilityExample (+200)
Positive Odds (+O)$IP = \frac{100}{O + 100}$$\frac{100}{200+100} = 33.3\%$
Negative Odds (-O)$IP = \frac{O

The Strategy:

  1. Calculate IP for a given bet.
  2. Estimate Your Own Probability (True Probability) based on detailed research, statistical models, and form analysis.
  3. Find the Edge: If your estimated True Probability is greater than the Implied Probability, you have found a Positive Expected Value (+EV) bet. This is a profitable bet in the long run, regardless of the short-term outcome.

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