No-Vig Calculator
Remove the bookmaker margin from a market to reveal the true fair odds and probabilities — the sharp price behind the line.
e.g. +150 or -110
Bookmaker margin (vig): 4.76%
| Outcome | Implied % | Fair % | Fair odds |
|---|---|---|---|
| Side A | 52.4% | 50.0% | +100 |
| Side B | 52.4% | 50.0% | +100 |
Omenizer devigs the sharpest markets automatically and flags every book priced above the fair line.
See live value bets →How it works
implied_i = 1 / decimal_odds_i overround = Σ implied_i (> 100% — the extra is the vig) fair_prob_i = implied_i / overround fair_odds_i = 1 / fair_prob_i
FAQ
- What is the vig?
- The vig (or juice / margin / overround) is the bookmaker’s built-in edge. If you add up the implied probabilities of every outcome they price, the total is over 100% — that extra is the vig.
- How do you remove it?
- Divide each outcome’s implied probability by the total (the overround). That rescales them back to 100% and gives the no-vig fair probability; invert it for the fair odds.
- Why does the fair price matter?
- The no-vig fair price is the market’s best estimate of the true probability. Comparing a book’s price to the no-vig fair price is how you find positive expected value.
- Which prices should I devig?
- Devig the sharpest, most efficient market you can find (a low-margin book or exchange). The sharper the source, the closer the no-vig line is to the true probability.
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Built by the team behind Omenizer’s real-time fair-odds engine — the same devigging and closing-line-value math that powers our live value-bet feed. Last updated July 2026.
Educational tool only. Not betting advice or a guarantee of profit.