No-Vig Calculator
Remove the bookmaker margin from a market to reveal the vig-free fair odds and probabilities — the sharp price behind the line.
e.g. +150 or -110
| Outcome | Implied % | Fair % | Fair odds |
|---|---|---|---|
| Side A | 52.4% | 50.0% | +100 |
| Side B | 52.4% | 50.0% | +100 |
The math, step by step
- 1. Convert each price to an implied probability — divide 1 by the decimal odds:Side A: 52.38% · Side B: 52.38%
- 2. Add them up — a fair market would sum to exactly 100%; the excess is the bookmaker's margin:52.38% + 52.38% = 104.76% → vig = 4.76%
- 3. Divide each implied probability by that total — this rescales the market back to 100%, giving the no-vig fair probability, and 1 ÷ fair probability is the fair price:Side A: 52.38% ÷ 104.76% = 50.00% (fair +100) · Side B: 52.38% ÷ 104.76% = 50.00% (fair +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
This tool removes the book’s edge. To measure how much vig a book is charging rather than remove it, use the vig / hold calculator.
Worked example
A sharp book prices a match −180 / +155. Implied probabilities are 1 ÷ 1.556 = 64.3% and 1 ÷ 2.55 = 39.2%, totalling 103.5% — a 3.5% vig. Divide each by 1.035: fair probabilities become 62.1% and 37.9%, i.e. fair odds of −164 / +164. If another book offers that underdog at +185, you’re getting a price well above the fair line — a positive-EV bet.
Common two-way lines, devigged
| Market | Total implied | Vig | Fair odds |
|---|---|---|---|
| −110 / −110 | 104.8% | 4.8% | +100 / +100 |
| −120 / +100 | 104.5% | 4.5% | −109 / +109 |
| −150 / +130 | 103.5% | 3.5% | −138 / +138 |
| −200 / +170 | 103.7% | 3.7% | −180 / +180 |
| +120 / −140 | 103.8% | 3.8% | +128 / −128 |
| −300 / +240 | 104.4% | 4.4% | −255 / +255 |
3-way no-vig calculator (soccer 1X2)
Three-way vig removal is the same proportional rescale, just spread across three prices. Say a book prices a match Home −120 / Draw +260 / Away +310. Implied probabilities are 1 ÷ 1.833 = 54.5%, 1 ÷ 3.60 = 27.8% and 1 ÷ 4.10 = 24.4%, totalling 106.7% — a 6.7% overround. Divide each by 1.067: fair probabilities become 51.1%, 26.0% and 22.9% (summing to exactly 100%), i.e. fair odds of −105 / +284 / +338. Switch the calculator above to 3-way to run your own 1X2 prices.
Common 1X2 lines, devigged
| Home / Draw / Away | Total implied | Vig | Fair odds |
|---|---|---|---|
| −120 / +260 / +310 | 106.7% | 6.7% | −105 / +284 / +338 |
| −110 / +250 / +300 | 106.0% | 6.0% | +102 / +271 / +324 |
| +150 / +220 / +190 | 105.7% | 5.7% | +164 / +238 / +207 |
| −250 / +380 / +650 | 105.6% | 5.6% | −209 / +407 / +692 |
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.
- How much vig is in a −110/−110 line?
- A standard −110 on both sides implies 52.38% + 52.38% = 104.76%, so the vig is about 4.76%. Removing it gives fair odds of +100 (50%) on each side.
- What is the multiplicative vs additive method?
- This calculator uses the simple (multiplicative) method: divide each implied probability by the total. Some sharps prefer additive or power/Shin methods on lopsided lines, which shift a bit of probability toward favorites. For most 2-way markets the difference is small.
- How do I remove the vig from 3-way (1X2) odds?
- The same proportional method works across three outcomes. Convert the home, draw and away prices to implied probabilities, add all three (the total will exceed 100%), then divide each by that total. The rescaled probabilities are the fair 1X2 chances; invert each for the fair odds. Switch this tool to 3-way to do it automatically.
- Is the no-vig price the same as the true probability?
- It’s the market’s best estimate, not a guarantee. A sharp book’s no-vig line is close to true; a soft book’s is noisier. Devig the sharpest source you can.
- What does a vig free calculator show?
- It shows the market with the bookmaker’s cut taken out: fair probabilities that sum to exactly 100%, and the fair odds they imply. Comparing any book’s price to that vig-free line tells you whether you’re getting value.
Related free tools
Live odds we track
Fair odds and best prices, computed live:
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 August 2026.
Educational tool only. Not betting advice or a guarantee of profit.