FREE TOOL

No-Vig Fair Odds Calculator

See the True Probability. Remove the "Vig" (Sportsbook Tax) to find the real price or Fair Odds.

Enter Sportsbook Odds

The line you want to bet (e.g. Eagles -185)
The opposite line (e.g. Opponent +140)

True Market Reality

Sportsbook Tax (Vig): 4.76%
Side A True Value
True Probability 50.0%
Fair Odds +100
Side B True Value
True Probability 50.0%
Fair Odds +100
💡
The sportsbook is charging a 4.76% tax on this market. To be profitable, your win rate must exceed 52.4%.

What is the No-Vig Fair Odds Calculator?

Sportsbooks don't charge you a subscription fee. Instead, they charge a hidden fee on every bet called the vig (or vigorish/juice). This is why standard lines are -110 on both sides instead of +100. Our calculator removes this tax to reveal the true implied probability of an event.

To win long-term, you need to know the Fair Odds—what the line should be if the sportsbook didn't take a cut. If you find a bet where the sportsbook's odds are better than the Fair Odds, you've found a Positive EV (Edge) bet.

How Sportsbooks Build Vigorish

Imagine a coin flip. The true odds are 50/50 (+100). But a sportsbook will offer -110 on Heads and -110 on Tails.

  • Implied Probability of -110: 52.38%
  • Total Market Percentage: 52.38% + 52.38% = 104.76%
  • The Vig: 4.76%

That extra 4.76% is the sportsbook's profit margin. You need to win at a rate higher than 52.38% just to break even.

How to Calculate Fair Odds Manually

If you don't have our calculator handy, here is the step-by-step process:

  1. Convert Odds to Probability: For negative odds (-X), use X / (X + 100). For positive odds (+X), use 100 / (X + 100).
  2. Sum the Probabilities: Add the implied probability of all outcomes (e.g., Team A + Team B).
  3. Remove the Vig: Divide each individual probability by the Total Sum.
  4. Convert Back to Odds: Use the new "True" probability to find the Fair Odds.

How to Use This Tool

  1. Find a line on your sportsbook (e.g., Lakers -3.5 at -110).
  2. Enter the odds for both sides of the bet (e.g., Lakers -110, Opponent -110).
  3. The calculator removes the vig to show you the True Probability of the outcome.
  4. Compare the "Fair Odds" to other books. If you can find odds better than the Fair Odds, you have an edge! Learn more about line shopping to find the best odds across multiple sportsbooks.

Frequently Asked Questions

Why is the no-vig line important?

The no-vig line (or fair odds) represents the market's true opinion on the probability of an outcome. It is the most accurate predictor of reality.

What does "Clt Vig" mean?

CLT is the Closing Line Value. When the market closes (game starts), the vig is usually at its lowest and the odds are at their sharpest. Beating the closing line is a strong indicator of a winning bettor.

Can I use this for 3-way markets?

Yes, this math applies to 3-way markets (Win/Draw/Win) as well, though you would need to sum the probabilities of all three outcomes to strictly remove the vig proportionally.

Want AI to Find The Edge For You?

Manually calculating edge is slow. TrueEdge analyzes thousands of props daily to find the biggest edges automatically.

Get Free AI Picks