De-Vig Calculator
Strip the juice from any sportsbook line to find the true fair odds. See exactly how much the book is charging you.
Market Odds
Fair Odds
Outcome 1
You're overpaying 2.4 cents per dollar bet
Outcome 2
You're overpaying 2.4 cents per dollar bet
Using the Power method — the most accurate for most markets.
Book's Take
For every $1 you bet, the book keeps 4.5 cents
Method Agreement
High agreementOutcome 1
All methods agree: 50.0%
Outcome 2
All methods agree: 50.0%
All methods produce similar results — any method gives a reliable answer.
What Does This Calculator Do?
Every sportsbook line has a built-in profit margin — bettors call it the vig, juice, or rake. When you see -110 on both sides of a spread, each side implies a 52.4% chance of winning. But 52.4% + 52.4% = 104.8%, which is impossible. That extra 4.8% is the book's cut. This calculator strips that cut out to show you what the book actually thinks the true odds are.
Why Are There Multiple Methods?
There's no single “right” way to remove the vig because we don't know exactly how each sportsbook distributes its margin. Some books might overcharge underdogs more, others might spread the margin evenly. Each method here uses a different assumption. The Power method is the most accurate for most markets because it accounts for the fact that books tend to overcharge longshots more than favorites.
The Methods in Plain English
Power (Recommended)
The most accurate for most markets. It knows that books overcharge underdogs more than favorites, and adjusts for that. Always gives valid results.
Multiplicative
The simplest approach — shrinks every side's probability by the same percentage. It's what most basic calculators use. Fine for equal matchups, but less accurate for lopsided ones.
Shin
Assumes the book builds in extra margin to protect itself from sharp bettors who might have inside information. Works well across most sports.
Probit
Uses a statistical bell curve to remove the margin. Especially good for simple 2-way markets like moneylines and spreads.
Additive
Removes a flat, equal amount from each side. Simple but can give weird results (like negative probabilities) for big underdogs.
When to Use Each Method
Not sure which method to pick? Here's a quick guide based on your market type:
- Most markets: Use Power. It handles lopsided lines well and is the most empirically validated method.
- Even matchups (-110/-110): All methods give virtually identical results when the market is balanced. Pick any.
- 2-way moneylines and spreads: Probit is excellent here, especially for NFL and NBA.
- 3-way markets (soccer): Power or Shin both work well. Avoid Additive — it can produce negative probabilities for heavy underdogs.
- Conservative estimate: Use Worst Case. It gives you the least favorable fair probability across all methods — if a bet is still +EV at worst case, it's a strong play.
How to Use It
- Enter the odds for each outcome from your sportsbook
- Pick your format — American (-110), Decimal (1.91), or Implied Probability (52.4%)
- The calculator instantly shows the true fair odds and how much you're overpaying
- Click “Compare all 7 methods” if you want to see how different approaches compare
Common Questions
Which method should I use?
Start with Power — it's the most accurate for most markets. If you're betting a simple 2-way market (like a moneyline), Probit also works great. If you want to be extra conservative, check the Worst Case row.
What's vig / juice?
It's the sportsbook's built-in profit margin. When both sides of a bet are -110, you have to risk $110 to win $100. That extra $10 is the vig. On average, the book keeps about 4-5 cents of every dollar wagered on standard lines.
Why do the fair odds matter?
If you have your own model or opinion about a game, you need to compare it against the TRUE probability — not the juiced line. If the fair probability is 50% but your model says 55%, you have an edge. If you're comparing against the juiced 52.4%, you're underestimating your edge.
Can I put this on my own website?
Yes! Click 'Embed This Tool' below the calculator for a copy-paste code snippet. It works on any website.
What is vigorish (vig)?
Vigorish — shortened to vig, and also called juice or rake — is the commission built into every sportsbook line. On a standard -110/-110 line, you risk $110 to win $100. The implied probabilities sum to 104.8%, not 100%. That 4.8% overround is the vig. It's how the book profits regardless of outcome.
How do I remove vig from 3-way odds?
Same principle as 2-way: enter all three outcomes (e.g., Home/Draw/Away in soccer). The calculator de-vigs by distributing the margin across all outcomes. 3-way markets often have higher vig (8-12%) because there are more outcomes for the book to shade. The Power method works well for 3-way markets too.