Enter your bet amount and odds in any format — American, Decimal, or Fractional — and this Odds Calculator converts between all formats and shows your implied probability, expected winnings, and total payout. Fill in one odds field and the rest auto-populate. Works for moneylines, spreads, and totals.
Total Payout
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Expected Winnings
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Implied Probability
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American Odds
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Decimal Odds
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Fractional Odds
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The calculator supports all four major odds formats: American (Moneyline), Decimal, Fractional, and Implied Probability. Simply choose your input format from the dropdown, enter your odds, and all other formats are calculated automatically.
Betting odds tell you two critical things: how likely an outcome is to happen and how much you stand to win if it does. By converting odds to implied probability, you can compare the sportsbook's estimate of an event against your own assessment — and find value bets where the true probability is higher than implied.
Implied probability is the win percentage built into the odds offered by a sportsbook, which includes their margin (the vig). True odds represent the actual statistical likelihood of an outcome. If you believe the true probability of a win is higher than the implied probability, that wager may offer positive expected value.
American odds use a +/- system based on a $100 stake. A negative number (e.g. -110) means you must bet that amount to win $100, indicating a favorite. A positive number (e.g. +150) means a $100 bet wins that amount, indicating an underdog.
Decimal odds (e.g. 1.91) represent the total return per $1 wagered, including your stake — popular in Europe and Australia. Fractional odds (e.g. 10/11) show profit relative to stake — popular in the UK. Both convey the same information but in different formats depending on your preferred sportsbook.
This calculator is designed for individual (single) bets. For parlays, you would multiply the decimal odds of each leg together, then use the resulting combined decimal odds to calculate your payout. Many bettors convert all legs to decimal first for easier parlay math.
Sportsbooks show payouts for the odds they offer, but this calculator lets you convert between formats, understand the implied probability behind any line, compare odds across multiple books, and quickly check value before placing your bet — giving you more insight than a simple payout display.
The vig (short for vigorish) is the sportsbook's commission built into the odds. For example, a standard -110 line on both sides of a bet means you pay more than true 50/50 odds — the sportsbook keeps a margin. Implied probabilities across a two-sided market will sum to more than 100% because of this built-in edge.