Sports Betting Odds Converter

Switching between American, Decimal, and Fractional odds takes a single step here, which matters when you are lining up prices across multiple sportsbooks before placing a bet. With the 2026 FIFA World Cup and the 2026 Winter Olympics drawing heavy action, being able to read every format quickly keeps you from leaving value on the table. The converter also surfaces the implied probability of an outcome and the payout your wager would return.

Each conversion follows the standard formulas. Positive American odds (+X) pay X on a $100 stake, while negative odds (-X) require you to risk X to collect $100. Decimal odds give the total return on a $1 stake with your stake folded in, and fractional odds express profit against stake, so 5/2 returns $5 in winnings for every $2 you put up. Implied probability comes from (Stake / Total Payout) regardless of which format you started with.

Decimal odds bundle your stake into the figure shown, which is exactly where bettors conflate payout with profit, so read the format your book is quoting before you do any math. There is also the vig, the book's built-in margin, which implied probability ignores entirely; add up the implied probabilities for every outcome in an event and the total will run past 100%, the house edge made visible.