No-Vig Odds
No-vig odds (also called fair odds or true odds) are the odds that would exist if the sportsbook charged zero margin. They represent the market's best estimate of true probability.
Quick Definition
No-vig odds are the theoretical odds that would exist if a sportsbook removed its profit margin (vig) from a market. They represent the market’s consensus estimate of true probability, stripped of the bookmaker’s edge. No-vig odds are used to calculate accurate expected value, measure CLV, and identify genuine betting edges.
Why No-Vig Odds Matter
When a sportsbook offers -110 on both sides of a spread, the implied probabilities sum to 104.76%, not 100%. The extra 4.76% is the vig. If you use the raw implied probabilities to calculate EV, you will always get a negative result because the vig is already baked in.
No-vig odds remove this distortion, giving you the market’s true probability estimate. This is essential for:
- Calculating accurate EV on potential bets
- Measuring CLV (comparing your odds to the true market price)
- Identifying which side of a market has genuine value
Calculating No-Vig Odds
Step 1: Convert all odds to implied probabilities.
For a two-way market:
- Team A: -110 → 52.38%
- Team B: -110 → 52.38%
- Total: 104.76%
Step 2: Divide each implied probability by the total.
Step 3: Convert back to odds.
- Team A no-vig odds: 1/0.50 = 2.00 (decimal) = +100 (American)
- Team B no-vig odds: 1/0.50 = 2.00 (decimal) = +100 (American)
This confirms what we already knew: a fair coin flip should be +100 on both sides.
Three-Way Market Example
A soccer match with three outcomes:
- Home win: +150 (implied: 40%)
- Draw: +220 (implied: 31.25%)
- Away win: +200 (implied: 33.33%)
- Total: 104.58%
No-vig probabilities:
- Home win: 40% / 104.58% = 38.25%
- Draw: 31.25% / 104.58% = 29.88%
- Away win: 33.33% / 104.58% = 31.87%
- Home win: 1/0.3825 = 2.61 decimal (+161 American)
- Draw: 1/0.2988 = 3.35 decimal (+235 American)
- Away win: 1/0.3187 = 3.14 decimal (+214 American)
If another sportsbook offers +175 on the home win, that is better than the no-vig price of +161. This is a +EV bet.
No-Vig Odds as a Benchmark
The most powerful use of no-vig odds is as a benchmark for identifying value. When you compare a sportsbook’s offered odds against the no-vig odds from a sharp book (Pinnacle), you can immediately see whether a bet is +EV or -EV.
Example:
- Pinnacle offers: Home win -115 / Away win +105
- Pinnacle no-vig: Home win +100 / Away win +100 (approximately)
- Recreational book offers: Home win +110
The recreational book’s +110 is better than Pinnacle’s no-vig +100. This is a +EV bet with approximately 4.8% edge.
No-Vig Calculators
Most value betting tools calculate no-vig odds automatically. You do not need to do this manually for every bet. Tools like OddsJam, RebelBetting, and Trademate Sports compare sportsbook odds against sharp benchmarks and display the no-vig edge for each opportunity.
However, understanding the calculation helps you:
- Verify tool outputs
- Calculate EV manually when needed
- Understand why certain bets are flagged as +EV
No-Vig Odds in CLV Measurement
When measuring CLV, you should compare your odds against the no-vig closing line, not the raw closing line. Using raw closing odds understates your CLV because the vig is included.
Example:
- You bet at +150
- Closing line: -110 / +100 (raw)
- No-vig closing line: +100 / +100
Your CLV against raw closing: +150 vs +100 = +50 points Your CLV against no-vig closing: +150 vs +100 = +50 points (same in this case)
In markets with asymmetric vig (where one side has more vig than the other), the difference between raw and no-vig CLV can be significant.
Practical Applications
Application 1: Line shopping. Calculate no-vig odds from the sharpest available book, then find sportsbooks offering better than no-vig odds. Any odds better than no-vig are +EV.
Application 2: Evaluating tipsters. A tipster claims +5% ROI. Calculate the no-vig odds for each of their picks. If their average odds are consistently better than no-vig, their edge is real. If not, their ROI may be variance.
Application 3: Promo evaluation. A sportsbook offers a profit boost on a specific market. Calculate the no-vig odds to determine the true value of the boost.
Application 4: Arbitrage identification. When the combined no-vig probability of all outcomes falls below 100%, an arbitrage opportunity exists.
Good Practices
Use sharp books for no-vig calculation. Pinnacle, Circa, and Bookmaker have the lowest vig and most efficient lines. Their no-vig odds are the most accurate probability estimates available.
Account for market timing. No-vig odds change as the market moves. Calculate no-vig odds close to the time you are considering betting, not hours earlier.
Use no-vig for EV, not just comparison. When calculating EV, always use no-vig probabilities as your baseline. Using raw implied probabilities will understate your edge.
Risk-Free Introduction
The easiest way to understand no-vig odds is to use a free no-vig calculator on any upcoming game. Enter the odds from a sharp book (Pinnacle) and see the no-vig prices. Then compare those prices to what recreational books are offering. You will immediately see which side has value.
Do this for 10-20 games before betting. You will develop an intuition for which markets tend to have value and which are efficiently priced.
Related Terms
- Vig - The margin that no-vig odds remove
- Expected Value - Calculated using no-vig probabilities
- Closing Line Value - Measured against no-vig closing lines
- Sharp Bookmaker - The source of accurate no-vig benchmarks