Bettor Ed No-Vig Calculator

• What is a No-Vig Calculator?

  • The No-Vig Calculator (also known as a Fair Odds Calculator) removes the vig or juice that sportsbooks include in their lines. The vig is the bookmaker’s margin — the small edge built into every market to ensure profit over time.
    By stripping away that margin, this calculator reveals the true implied probability and fair odds for each side of a bet. It’s the easiest way for U.S. bettors using sportsbooks like FanDuel, DraftKings, BetMGM, or BetOnline to find the real market price before placing a wager.

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• How do you calculate no-vig odds?

  • Here’s how the calculator determines vig-free odds step by step:

  • Step 1: Convert American odds to probabilities
    If odds are positive:
    Probability = 100 / (Odds + 100)
    If odds are negative:
    Probability = |Odds| / (|Odds| + 100)

  • Step 2: Add both probabilities
    Sum = Probability 1 + Probability 2
    This total is usually greater than 1, because it includes the sportsbook’s vig.

  • Step 3: Remove the vig
    Divide each probability by the sum to normalize them to 1.
    Vig-free Probability 1 = Probability 1 / Sum
    Vig-free Probability 2 = Probability 2 / Sum

  • Step 4: Convert back to no-vig odds
    If the no-vig probability is greater than 0.5:
    Fair Odds = −(No-Vig Prob / (1 − No-Vig Prob)) × 100
    If it’s 0.5 or less:
    Fair Odds = ((1 − No-Vig Prob) / No-Vig Prob) × 100

  • The result gives you the fair American odds and true probabilities for both sides of the market — completely vig-free.

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• How does this calculator help me?

  • The No-Vig Calculator helps you find fair prices and value bets across sportsbooks. By comparing the vig-free odds to what’s being offered by books like FanDuel, Caesars, or BetMGM, you can immediately see whether a line is overpriced or underpriced.

  • This makes it an essential tool for anyone practicing value betting, line shopping, or calculating expected value (EV) more accurately.​​

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