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Calculator Answers

No-Vig Calculator

Blake Boege
Written by Blake Boege · Founder, Calculator Answers

A no-vig calculator is a sports betting utility that removes the sportsbook's built-in commission, known as vigorish or juice, from wager odds. Sportsbooks artificially inflate odds to ensure a profit by creating a total implied probability that exceeds one hundred percent. The calculator converts odds into raw implied probabilities, normalizes them by dividing each by the total sum, and converts these true probabilities back into fair, zero-margin odds. Sports bettors use this tool to determine the true probability of an event, compare lines, and identify positive expected value wagers.

Calculate fair, no-vig betting odds and find the true implied probability of an event. Supports American, Decimal, and Fractional odds format inputs for both outcomes.

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Quick Answer

Remove the house edge or commission from sports betting odds. Enter the odds for both outcomes to find the fair, zero-margin odds and true implied probabilities.

Fair Odds Comparison

OutcomeAmericanDecimalFractional
Outcome 1+1002.001/1
Outcome 2+1002.001/1
No-Vig Projections

Estimated House Vig: 4.55%

+100 / +100

Fair odds calculated from 104.8% total book probability.

Total Book Probability104.76%
House Vig (Juice)4.55%
Market Overround4.76%
Outcome 1 Raw Prob52.38%
Outcome 2 Raw Prob52.38%
Outcome 1 Fair Prob50%
Outcome 2 Fair Prob50%
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Examples

-110 and -110 standard spread odds

Implied = 52.38% / 52.38% · Fair Prob = 50.00% · Fair Odds = +100 / +100 · Vig = 4.55%

+150 underdog and -180 favorite

Implied = 40.00% / 64.29% · Sum = 104.29% · Fair Odds = +161 / -161 · Vig = 4.11%

+200 underdog and -250 favorite

Implied = 33.33% / 71.43% · Sum = 104.76% · Fair Odds = +220 / -220 · Vig = 4.55%

How it works

The calculator strips the sportsbook's built-in commission (vig) from the odds to expose the market's true underlying probabilities.

House Vig (Juice) Formula

Vig = 1 − (1 / (Implied Prob 1 + Implied Prob 2))

Fair Probability Normalization

Fair Prob = Implied Prob / (Implied Prob 1 + Implied Prob 2)

Why Sportsbooks Add Vig

Sportsbooks are businesses, and the vig is how they pay for their operations and generate a profit. In a balanced market where equal money is bet on both sides of a coin-flip type game, a sportsbook offering -110 odds on both outcomes collects $110 from each of two bettors ($220 total). Regardless of who wins, the bookmaker pays out $100 plus the winner's original $110 stake ($210 total), pocketing the remaining $10 as risk-free profit.

How to Use Fair Odds for Value Betting

Value betting is the practice of identifying odds that are priced higher than the event's actual probability of occurring. By removing the vig from sharp, high-volume sportsbooks (which have the most accurate odds), you can determine the true probability. If another sportsbook offers odds that are higher than these fair odds, you have found a positive expected value (+EV) wager.

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Frequently asked questions

Vig (short for vigorish, also known as the juice, margin, or cut) is the fee or commission that a sportsbook charges for accepting a wager. Sportsbooks build this commission into the odds, ensuring they make a profit regardless of the outcome by taking more total money than they payout.

The calculator first converts the odds for both outcomes into implied probabilities. The sum of these probabilities will exceed 100% due to the sportsbook's built-in commission. The calculator then normalizes these probabilities by dividing each by the total sum, producing the true 'fair' probabilities. Finally, it converts those fair probabilities back into fair odds.

Overround is the amount by which the sum of all implied probabilities exceeds 100%. For example, if both outcomes have implied probabilities of 52.38% (-110 odds), the overround is 4.76%. Vig is the commission expressed as a percentage of the total handle, which is calculated as: Vig = 1 - (1 / Sum of Probabilities). For -110/-110, the overround is 4.76% and the vig is 4.55%.

Calculating no-vig odds is essential for professional sports bettors to find the 'true' probability of an event. By knowing the fair odds, you can compare them to odds offered at other sportsbooks and identify positive expected value (+EV) bets.

For negative American odds (e.g., -110), the formula is: Prob = |Odds| / (|Odds| + 100). For positive American odds (e.g., +150), the formula is: Prob = 100 / (Odds + 100).

This version is optimized for 2-way markets (like point spreads, moneylines, and game totals). To remove vig from a 3-way market, you sum all three probabilities and normalize each similarly.