What Are No-Vig Odds? Definition + How to Calculate Them
No-vig odds (also called fair odds or true odds) are sportsbook prices with the bookmaker’s built-in commission — the “vig” or “juice” — mathematically removed. They represent the true implied probability the market is assigning to an outcome. Sharp bettors use no-vig odds to measure expected value and Closing Line Value accurately.
How No-Vig Odds Work
Every sportsbook line includes vig. A standard NFL spread of -110/-110 doesn’t mean the book thinks each side has a 50% chance — it means each side’s implied probability is 52.38%, totaling 104.76%. That extra 4.76% is the vig (also called overround or hold).
To find no-vig odds, normalize the implied probabilities so they add to 100%.
Worked example: NFL spread Cowboys -3 (-110) vs. Eagles +3 (-110)
Step 1 — Convert American odds to implied probability:
- -110 → 110 / (110 + 100) = 0.5238 (52.38%)
- -110 → 110 / (110 + 100) = 0.5238 (52.38%)
- Total = 1.0476 (104.76%)
Step 2 — Normalize (divide each by the total):
- Cowboys: 0.5238 / 1.0476 = 0.5000 (50.00%)
- Eagles: 0.5238 / 1.0476 = 0.5000 (50.00%)
Step 3 — Convert no-vig probability back to American odds:
- 50.00% = +100 (true even-money price)
The book is offering -110 on a true 50/50 line. The 4.76% gap is the vig. To break even at -110, you need to win 52.38% of bets.
Asymmetric example: Yankees ML -150 / Red Sox ML +130
- -150 implied = 60.00%
- +130 implied = 43.48%
- Total = 103.48%
- No-vig Yankees = 60.00 / 103.48 = 57.98% → fair odds -138
- No-vig Red Sox = 43.48 / 103.48 = 42.02% → fair odds +138
If your model says the Yankees should win 62%, you have a +EV bet at -150.
How to Use No-Vig Odds When Betting
- Find +EV bets: Compare your model’s probability to the no-vig line. If your number is higher, you have an edge.
- Measure CLV: Calculate no-vig at your bet time and at close. The difference is true CLV.
- Shop lines: Convert prices at multiple books to no-vig and bet the best one.
- Use a tool: PropsBot’s No-Vig Fair Odds Calculator does this instantly.
PropsBot’s MLB models post a Brier score of 0.1903 vs. Vegas 0.1947 — meaning the model’s probability estimates are better-calibrated than the market’s no-vig price, which is how the High ROI Signal produced +60,778 units profit across all sports.
Common Mistakes and Misconceptions
- “-110 means 50/50.” It doesn’t. -110 implies 52.38%; the no-vig fair odds are +100.
- Forgetting to normalize: Just converting odds to implied probability isn’t enough — you have to remove the overround.
- Using vig’d odds for EV math: This always understates your edge. Always strip vig first.
- Assuming all books vig equally: Reduced-juice books (like -105/-105 lines) have lower vig and are sharper to bet into.
FAQ
What is the typical vig on a -110/-110 line?
4.76%. The book holds an expected 4.76% on balanced action.
What is the no-vig formula?
Convert each side’s odds to implied probability, sum them, and divide each side’s probability by the sum. That’s the no-vig probability.
Why do sharp bettors care about no-vig odds?
Because they reveal the true market price. You can’t measure expected value or CLV against a vig’d number.
Are reduced-juice books better?
Yes. Books at -105/-105 have ~2.4% vig vs. the standard 4.76%. Lower vig means more profit on winning bets.
Can I calculate no-vig for player props?
Yes — same formula. Prop markets often have higher vig (8-10%), so removing it is even more important.
Internal Links
- /tools/no-vig-fair-odds-calculator/ — Auto-calculate no-vig odds for any market
- /glossary/closing-line-value/ — Use no-vig odds to measure CLV
- /glossary/moneyline/ — Understand American odds before stripping vig
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