In probability theory, odds provide a measure of the probability of a particular outcome. Odds are commonly used in gambling and statistics. For example for an event that is 40% probable, one could say that the odds are "2 in 5", "2 to 3 in favor", "2 to 3 on", or "3 to 2 against".
Convert odds into probability and percent chance of winning and losing. This calculator converts odds for winning or odds against winning into percentage chance for winning or losing.
Both odds and probabilities are calculated as ratios. To avoid confusion, we will always use fractions, decimals, or percents for probabilities, and we’ll use colons to indicate odds.
Here's everything you need to know about the different types of betting odds and what all the numbers mean, updated October 2025. Sports betting 101 begins with knowing how to read theodds and understanding how they work.
View the Top Odds of the day powered by Draft Kings for NFL, NBA, MLB, NHL and more top league games. Includes opening lines and current spread, moneyline, and totals.
Use this bet calculator to easily calculate and convert between american odds (moneyline odds), decimal odds, fractional odds, and implied odds. Calculate the implied probability given odds and determine the payout and potential winnings from a bet (how much do you win).
Convert odds into probability and percent chance of winning and losing. This calculator converts odds for winning or odds against winning into percentage chance for winning or losing.