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No-Vig Calculator
Remove the sportsbook's margin from any two-way or three-way market to see the fair odds and true implied probability — and check whether a price you can get beats it.
Market odds (American)
Optional — the price you can get
Fill this to see your EV against the fair line. Leave it empty to just devig the market.
The sportsbook's margin baked into this market. Fair odds below have it removed.
| Side | Implied | Fair % | Fair Odds |
|---|---|---|---|
| Side A | 52.38% | 50.00% | +100 · 2.000 |
| Side B | 52.38% | 50.00% | +100 · 2.000 |
Vig removed by the multiplicative method — fair percentages sum to exactly 100%.
This, on every bet — automatically
You just devigged one market by hand.
TrueLine devigs Pinnacle's closing line on every bet you log and grades your price against it — the same fair-value test you just ran, applied to your whole betting history.
How the math works
Each price has an implied probability that includes the vig, so across a market they sum to more than 100%. The multiplicative method scales every side by the same factor so they sum to exactly 1:
implied_i = americanToImplied(odds_i) overround = Σ implied_i (vig = overround − 1) fair_i = implied_i / overround → Σ fair_i = 1 fair_odds = 1 / fair_i (decimal)
The multiplicative method is the standard, transparent approach. Additive, power, and Shin methods also exist and can differ on heavy longshots; this tool stays multiplicative for v1.
When you enter a price you can get, the EV figure is fair_p × (yourDecimal − 1) − (1 − fair_p) — the exact expected value per dollar the EV calculator reports, using the shared TrueLine math. Devigging a sharp book like Pinnacle gives the most reliable fair number.
All math runs in your browser. We don't log or store your inputs.
Frequently asked questions
What is the vig (juice)?
The vig — also called juice or margin — is the sportsbook's built-in commission. It's why the implied probabilities of both sides of a market add up to more than 100%. On a standard -110 / -110 market each side implies about 52.4%, summing to ~104.8%; that extra 4.8% is the vig, the book's edge.
What does devigging tell you?
Devigging removes the sportsbook's margin so the two (or three) sides sum to exactly 100%, revealing the market's true implied probability and fair odds. On a sharp book, the de-vigged number is the best available estimate of an outcome's real probability — the benchmark you compare your own price against to know if you're getting value.
Which devig method does this calculator use?
The multiplicative method: it takes each side's raw implied probability and scales them all by the same factor so they sum to 1. It's the standard, transparent approach. Additive, power, and Shin methods also exist and can differ slightly on heavy longshots; this tool keeps to the multiplicative method for v1.
Why devig Pinnacle specifically?
Pinnacle is widely regarded as the sharpest sportsbook in the world — they welcome winners and run on low margins, so their lines track true probability closely. De-vigging Pinnacle's price gives the most reliable fair number to measure other books against. TrueLine benchmarks every tracked bet against Pinnacle's de-vigged closing line.