Implied Probability Calculator

What Is Implied Probability?

Implied probability converts American (moneyline) betting odds into the percentage chance of an outcome occurring, according to the bookmaker's line. It is widely used in sports betting analysis to compare odds across markets and identify value bets. See also the Decimal Odds Calculator and Fractional Odds Calculator.

Conversion Formulas

For positive American odds (+odds):

$$\text{Implied Probability} = \frac{100}{\text{odds} + 100}$$

For negative American odds (-odds):

$$\text{Implied Probability} = \frac{|\text{odds}|}{|\text{odds}| + 100}$$

Example: Basketball Moneyline

Golden State Warriors at -150 means you must bet $150 to win $100. Implied probability = $150 / (150 + 100) = 60\%$. Positive +200 odds imply $100 / (200 + 100) = 33.33\%$ chance.

Related Tools

• Probability Calculator
• Conditional Probability Calculator
• Expected Value Calculator