There are different ways that sportsbook can display their odds on an event. In the US, it is common to see American odds. In American odds, the favorite appears with a minus sign and the underdog with a plus sign. The numeral illustrates the extent to which a favorite is favored to win, or an underdog is expected to lose.

For the favorite, the odds show how much you need to bet in order to win $100. For the underdog, the odds show how much a $100 bet would return.

To illustrate, a slight favorite would carry odds of say -200, while a heavy favorite might be at -1500. Meaning you would need to wager $200 and $1500, respectively, to win $100.

For a slight underdog at +200 or a heavy underdog at +1500, a $100 bet would return $200 and $1500, respectively.

In Europe, bookmakers usually display decimal odds. Most online sportsbooks allow players to choose the style of odds display they are most comfortable with.

See for yourself below how American odds translate across to other odds formats using our Betting Calculator.

Betting Odds Calculator

Quickly input your stake and odds in American, Decimal, or Fractional formats to calculate the payout for your bets.

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Bet Amount

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Payout ($)


Product manager at the AllStar, and the Nerd who made the fantasy MMA app.