Devig Calculator
Enter two-way American odds and select a method to remove the vig and find the true fair lines.
Two-way market
Enter both sides and pick a devig method.
| Side 1 | Side 2 |
|---|---|
Total implied (with vig)
104.76%
| Side 1 | Side 2 | |
|---|---|---|
| Fair % | 50.00% | 50.00% |
| Fair American | -100 | -100 |
| Fair decimal | 2.000 | 2.000 |
Frequently Asked Questions
What does it mean to devig odds?
Devigging (or de-juicing) removes the sportsbook's built-in margin from the odds. This reveals the bookmaker's implied "fair" probability for each outcome, which you can use to identify value bets.
Which devig method should I use?
Multiplicative is the most common and works well for most markets. Power method is more accurate for lopsided odds. Shin method models the presence of informed bettors and is popular in academic literature. Additive is the simplest approach that distributes the overround equally.
How do I use fair odds to find +EV bets?
Once you have the fair probability, compare it to the implied probability of the odds you can actually bet. If the book offers odds that imply a lower probability than the fair probability, the bet has positive expected value (+EV).
Why do different methods give different results?
Each method makes different assumptions about how the bookmaker distributes margin. Multiplicative assumes proportional distribution, additive assumes equal distribution, power adjusts by odds magnitude, and Shin accounts for informed money. The differences are usually small for balanced markets.
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