Calculate the bookmaker's margin (vig) and find true odds using multiple devigging methods. See how much edge the book has built in.
Bookmaker Margin
0%
House edge on this market
Fair market = 100%. Above 100% = bookmaker margin.
| Outcome | Book Odds | Implied % | True % | Fair Odds |
|---|
Enter odds for all outcomes
Divides each probability by the total to normalize to 100%. Assumes margin is distributed equally.
Accounts for informed bettors. Assumes more margin on longshots, less on favorites. Industry standard.
Uses an exponent to adjust probabilities. Similar results to Shin but uses a different mathematical approach.
OddsElite compares odds across bookmakers so you always bet at the best price. Lower margins mean higher expected value.
See live edgesThe margin (also called vig, juice, or overround) is the bookmaker's built-in profit. It's the difference between the true probability of outcomes and the odds they offer. A 5% margin means for every $100 wagered, the bookmaker expects to keep $5 regardless of the outcome.
For a fair coin flip (50/50), fair decimal odds would be 2.00 on both sides.
Fair Market (0% margin)
Both sides: 2.00
Total implied: 50% + 50% = 100%
With 4.5% margin
Both sides: 1.91 (-110)
Total implied: 52.4% + 52.4% = 104.5%
Devigging removes the bookmaker's margin to find the "true" probability and fair odds. This is essential for calculating expected value and identifying which side offers value. Sharp bettors always compare the devigged line (true odds) against their own probability estimate.
Developed by Hyun Song Shin, this method assumes bookmakers protect themselves against informed bettors by adding more margin to longshots. The intuition: insiders are more likely to bet on specific outcomes (longshots) where they have information. Shin's model is considered the most realistic representation of how bookmakers actually set odds.
| Bookmaker Type | Typical Margin | Example Odds | Notes |
|---|---|---|---|
| Sharp Books (Pinnacle) | 2-3% | 1.95 / 1.95 | Best prices, accept sharp action |
| Standard US Books | 4-5% | 1.91 / 1.91 (-110) | Industry standard for spreads |
| Soft Books | 6-8% | 1.87 / 1.87 | Higher margins, more promos |
| Soccer 3-Way | 5-8% | Varies | 3 outcomes = higher margin |
| Props / Exotics | 8-15% | Varies widely | Less liquid markets |