No-Vig Fair Odds Calculator

No-vig odds are market prices with the sportsbook’s margin removed. They express a market-based estimate of fair odds, using the prices for every outcome in the same market.

The estimate depends on the prices and the method used to remove vig. It does not establish each outcome’s true probability. Use it as a reference when comparing the odds available to bet.

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Use the No-Vig Fair Odds Calculator to compare the price available to bet with a market-based estimate of fair odds.

• Compare prices: Remove margin from a reference market, then compare that estimate with the price offered by another sportsbook.
• Understand the math: See how implied probabilities change when the margin is removed.
• Check your assumptions: A potential edge depends on the quality of the reference market and the de-vigging method. The result alone does not prove that a wager has positive expected value.

Keep the same market, line and set of outcomes together when entering prices. Combining different lines can produce a misleading comparison.

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Convert each price to an implied probability, then add the probabilities for all outcomes in the market.

1. For positive American odds: implied probability = 100 ÷ (odds + 100).
2. For negative American odds: implied probability = |odds| ÷ (|odds| + 100).
3. Subtract 1 from the sum to calculate overround. Divide that overround by the sum to calculate theoretical hold.

At −110 on both sides, the probabilities total 104.76%. Overround is 4.76 percentage points and theoretical hold is 4.55%. A proportional no-vig calculation divides each implied probability by the sum, producing 50% and fair odds of +100 on each side.

These measures describe the prices. They do not guarantee the sportsbook’s realized profit or establish the outcomes’ true probabilities.

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Vig is short for vigorish. In sports betting, vig or juice describes the margin built into a sportsbook’s prices.

That margin is part of the sportsbook’s pricing model. Actual profit also depends on the bets taken and their results; vig does not guarantee a profit on every event.

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