Free Sports Betting Odds Converter

Type any odds value in the format you know — American, decimal, fractional, or implied probability — and all other fields update instantly. Enter a bet amount to see your exact profit and total payout.

Use the implied probability field to quickly check whether a line is offering value compared to your own win-probability estimate. If your estimate is higher than the implied probability, you have a positive-EV bet.

An odds converter translates the same probability between the four formats sportsbooks use worldwide. American odds dominate US books, decimal odds are standard in Europe and Australia, fractional odds are common in the UK, and implied probability converts any odds into the percentage chance of winning implied by the price.

Knowing how to move between formats helps you compare lines across different books, quickly check the value of a price, and understand your expected profit before placing a bet.

American odds (also called moneyline odds) are centered around $100. A positive number like +150 means you profit $150 for every $100 wagered. A negative number like -150 means you must wager $150 to profit $100.

Even money is expressed as +100 or -100 depending on which side of a two-sided market you are on. The further a favorite is priced (e.g., -300), the more you must risk for a smaller return.

Decimal odds represent your total return per $1 wagered, including your stake. Odds of 2.50 return $2.50 for every $1 bet — $1.50 profit plus your original $1 back. Decimal odds are always greater than 1.0; odds of exactly 2.00 represent even money.

Decimal odds are the easiest format to use for parlay (accumulator) calculations because you simply multiply the decimals of each leg together.

Fractional odds show profit relative to stake. Odds of 5/2 mean you profit $5 for every $2 wagered. The left number (numerator) is your profit; the right number (denominator) is your required stake. Evens is written as 1/1.

To convert a fraction to a decimal, divide the numerator by the denominator and add 1. For example: 5/2 = 2.5 + 1 = 3.5.

Implied probability is the percentage chance of winning that a given price suggests. Decimal odds of 2.00 imply a 50% chance of winning (1 ÷ 2.00 = 0.50). A -110 American line implies roughly 52.4% — slightly above 50% because of the sportsbook's built-in margin (the vig or juice).

Adding up the implied probabilities of both sides of a market gives you a number above 100%. That excess — typically 4–8% — is the book's edge. Finding lines where your own probability estimate exceeds the implied probability is the core of finding value bets.