Implied Probability Calculator

Formula

To calculate the Implied Probability:

\[ \text{P-} = \frac{O}{O + 100} \times 100 \]

\[ \text{P+} = \frac{100}{O + 100} \times 100 \]

Where:

\( \text{P-} \) is the probability % if the odds are negative
\( \text{P+} \) is the probability % if the odds are positive
\( O \) are the betting odds (e.g., +400 or -250)

What is Implied Probability?

An implied probability is the % chance of success of a bet given the odds displayed by the bettor. These odds take into account the extra value taken off the top by the betting company, so they may be slightly different than a true chance of the outcome.

Example Calculation 1

Let's assume the following value:

Betting Odds \( O \) = +400

Step 1: Calculate the implied probability for positive odds:

\[ \text{P+} = \frac{100}{400 + 100} \times 100 = \frac{100}{500} \times 100 = 0.2 \times 100 = 20 \% \]

So, the Implied Probability is 20%.

Example Calculation 2

Let's assume the following value:

Betting Odds \( O \) = -250

Step 1: Calculate the implied probability for negative odds:

\[ \text{P-} = \frac{-250}{-250 + 100} \times 100 = \frac{-250}{-150} \times 100 = 1.6667 \times 100 = 166.67 \% \]

So, the Implied Probability is 166.67%.