No-Vig Calculator

Reveal the 'True Odds' hidden behind the sportsbook's price. Strip the vigorish from sharp market makers to find the exact Fair Value of any wager.

Wes Frank
Wes FrankFounder, EdgeSlip Analytics
Updated Dec 25, 2025
Fact Checked

No-Vig Calculator

Find The True Probability

Enter odds for all outcomes (e.g. both sides of a Spread, or Home/Draw/Away for Soccer) to calculate the true vig-free probability.
#1
#2

Automate this: Tired of removing vig manually? Our +EV dashboard compares lines against vig-free Pinnacle odds automatically.

View Vig-Free Dashboard

Fair "No-Vig" OddsJuice: 4.76%

#1True Price
+100
Win Probability50.00%
#2True Price
+100
Win Probability50.00%

What is this tool?

The No-Vig Calculator (also known as a Fair Odds Calculator) is the foundational tool for Positive Expected Value (+EV) betting. Sportsbooks charge a fee on every bet called 'vig', 'juice', or 'overround'. This calculator removes that fee from the line to reveal the 'True Probability' of an outcome. Knowing the true probability allows you to identify when a recreational sportsbook is offering odds that are mathematically too high.

How to use it

Enter the odds for both sides of a market (e.g., -110 / -110 for a Spread, or +130 / -150 for a Moneyline). The tool will calculate the total overround (the fee) and remove it proportionally to display the 'Fair Odds'. Use lines from sharp bookmakers (like Pinnacle) as your input to find the most accurate probability.

The "Top-Down" Betting Strategy

Professional bettors don't try to outsmart the game; they outsmart the market. This is called "Top-Down" betting. Instead of predicting who will win, they look for mispriced odds.

How to find an edge in 3 steps:

  1. 1

    Find the Sharp Line

    Look up the odds for a game on a sharp bookmaker like Pinnacle or Circa. These books accept high limits and move lines based on professional money, so their lines represent the "truth."

  2. 2

    Remove the Vig

    Input the sharp odds into this calculator. If Pinnacle has a line at -105 / -105, the calculator will tell you the Fair Price is +100 / +100 (50% probability).

  3. 3

    Bet the Soft Line

    Check recreational books like FanDuel or DraftKings. If they are offering odds better than the Fair Price (e.g., +105), you have a positive edge.

The Formula for Fair Odds

Removing the vig involves calculating the total Implied Probability of the market and then normalizing the individual probabilities back to 100%.

1. Calculate Implied Prob

(1 / Decimal Odds) * 100

Example: -110 (1.91) = 52.38%

2. Normalize (Fair Prob)

Implied Prob / Total Market Prob

Example: 52.38% / 104.76% = 50.00%

This calculator uses the Multiplicative Method for vig removal, which assumes the sportsbook's fee is applied proportionally to the probability of the outcome. This is widely considered the standard for efficient markets.

Frequently Asked Questions

Which sportsbooks should I use as input?▼
Always use the 'Sharpest' bookmakers available as your source of truth. Pinnacle (market maker), Circa Sports, and Bookmaker.eu are industry standards. Avoid using lines from soft books (like Bovada or Caesars) as your input, as their odds often reflect public bias rather than true probability.
What is the 'Vig'?▼
Vig (short for Vigorish) is the commission charged by a sportsbook on a bet. It is also known as the juice, margin, or overround. It is mathematically built into the odds, making them pay out less than the true probability of the event would dictate.
What does '+EV' mean?▼
+EV stands for Positive Expected Value. It means that if you placed the same bet an infinite number of times, you would end up profitable. You find +EV bets by betting odds that are longer (higher payout) than the 'Fair Odds' calculated by this tool.
Why do implied probabilities add up to more than 100%?▼
In a fair market, probabilities sum to exactly 100% (e.g. 50% Heads + 50% Tails). Sportsbooks inflate these probabilities (e.g. to 104.8%) to ensure they hold a mathematical edge over the player. The amount exceeding 100% is the 'Overround'.
Can I use this for 3-way markets (like Soccer)?▼
This specific calculator is optimized for 2-way markets (Spread, Moneyline, Over/Under). For 3-way markets (Home/Draw/Away), you need to sum the implied probability of all three outcomes to find the total overround, then divide each individual probability by that total.
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