Moneyline Odds Calculator

American (moneyline) odds convert into decimal odds and an implied win probability.

How the Math Works

Moneyline odds are converted using two different formulas depending on whether the odds are positive or negative. For positive moneyline odds (above +100), the decimal odds equal 1 plus 100 divided by the moneyline number. For negative moneyline odds (below -100), decimal odds equal 1 plus the absolute value of the moneyline divided by the moneyline number. The implied probability is then calculated by dividing 1 by the decimal odds and multiplying by 100 to get a percentage.

Practical Applications

To use this calculator, simply enter the American moneyline odds from any sportsbook or betting site into the input field. The calculator instantly converts these odds into decimal format (commonly used in Europe), fractional odds (traditional UK format), and shows the implied probability percentage. This allows you to quickly compare odds across different sportsbooks, understand your potential payout for different bet sizes, and evaluate whether the offered probability represents good value based on your own assessment of the event's likely outcome.

Day-to-Day Use

Understanding these conversions helps you make better betting decisions and find the best value in sports betting. When comparing odds between different books, you can quickly see which offers the highest payout for the same event. The probability conversion helps you assess whether odds are generous or if the bookmaker has significant margin built in. Beyond betting, this knowledge helps you understand how probability works in real-world scenarios, from evaluating insurance quotes to comparing investment opportunities where risk and reward are expressed differently.

Worked example

-150 gives decimal 1.667 and a 60% implied probability.

FAQ