No-Vig Calculator
How To Use This Calculator
Remove the bookmaker's margin to find the true "fair" odds and probability. This helps you identify value bets by comparing against your sportsbook's odds.
Input odds for both sides from a sharp book (like Pinnacle).
We recommend "Worst Case" for the most conservative estimate.
The odds offered by your sportsbook for the bet you want to place.
See fair odds, EV%, and recommended bet size.
What is the Vig (Juice)?
The vig (also called "juice" or "house edge") is the bookmaker's commission built into the odds. It's how sportsbooks guarantee profit regardless of the outcome.
When you see -110 on both sides of a bet, the implied probabilities add up to more than 100%. That difference is the vig - typically 4-10% at most sportsbooks.
Devigging Methods Explained
Distributes vig proportionally to each side's implied probability. Simple and widely used, but may underestimate longshot probabilities.
Divides the vig equally between both sides. Better accounts for favorite-longshot bias but can overcorrect in some situations.
Uses mathematical optimization to find probabilities. Keeps values in valid range but may over-adjust for longshots.
Uses the lowest probability from all methods - the most conservative estimate for calculating your edge. Best for avoiding false positives when finding +EV bets.
Devigging Methods Comparison
| Method | Best For | Accuracy | Bias Handling |
|---|---|---|---|
| Multiplicative | Even-money markets | Good for balanced lines | Underestimates longshot probability |
| Additive | Markets with favorite-longshot bias | Better for lopsided odds | Accounts for bias but can overcorrect |
| Power | Academic analysis | Often considered most robust | Nonlinear adjustment, may over-adjust longshots |
| Worst Case | Finding +EV bets (recommended) | Most conservative estimate | Minimizes false positives across all methods |
Step-by-Step Worked Example
Pinnacle has an NFL game at -180 / +155. Your sportsbook offers the favorite at -180. What are the fair odds?
Fair favorite odds: 1 / 0.621 = -164. If your book offers -180, you have an edge because -180 is better than the fair odds of -164.
Common Mistakes to Avoid
Using odds from high-margin books (like DraftKings or FanDuel) to devig gives inaccurate fair probabilities. Always use sharp book odds with low margins (1-3%).
The multiplicative method underestimates longshot probabilities. For lopsided lines, consider additive or worst-case methods for more accurate results.
Sharp book odds move quickly. If you devig from odds that are minutes old, the fair probability may have already shifted. Always use the most current lines.
Fair odds represent market probability, not certainty. A 60% fair probability means you'll still lose 40% of the time. Always combine with proper bankroll management.
Frequently Asked Questions
Why should I use sharp book odds?
Sharp books like Pinnacle and Circa Sports have lower margins (1-3%) and more accurate lines because they accept bets from professional bettors. Their odds reflect the true market probability better than recreational sportsbooks with 5-10% margins.
Which devig method is most accurate?
No method is perfect for all situations. "Worst Case" is recommended because it gives you the most conservative edge estimate, reducing false positives. For academic accuracy, Power method is often considered most robust.
How do I find Pinnacle odds?
Our Odds Comparison tool shows odds from Pinnacle alongside 400+ other sportsbooks. You can also check Pinnacle directly if you have access, or use odds comparison sites.
What's the difference between vig and margin?
They're the same thing - different names for the bookmaker's built-in profit. "Vig" (short for vigorish) and "juice" are common in American betting, while "margin" and "overround" are used internationally.
Can you devig three-way odds (like soccer)?
Yes, the same devigging methods work for three-way markets like soccer match result (home/draw/away). The vig is distributed across three outcomes instead of two. The mathematical principles are identical.
What is the typical vig percentage at US sportsbooks?
Most US recreational sportsbooks charge 4-10% vig on standard markets. The standard -110/-110 line carries about 4.8% vig. Prop bets and parlays often have much higher margins (10-20%). Sharp books like Pinnacle operate with 1-3% margins.
Why do different devigging methods give different results?
Each method makes different assumptions about how bookmakers distribute their margin. Multiplicative assumes proportional distribution, additive assumes equal distribution, and power uses nonlinear optimization. The differences are larger when odds are lopsided (heavy favorite vs. longshot).
Pro Tip: Use Sharp Book Lines
For best results, always use odds from sharp books like Pinnacle or Circa Sports as your devigging source. These books have lower margins and more accurate lines, giving you the most reliable fair odds estimate. Never devig from recreational sportsbooks with high margins.