Guide
How to remove the vig from a two-way market
To remove the vig from a two-way market, turn both prices into implied win chances, add them up, and divide each chance by that total so they sum to 100%; the results are the no-vig chances and fair odds.
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By the Betwatch team. Published Nov 1, 2026, updated Nov 4, 2026.
Worked example: Knicks -150, Celtics +125
Convert each price to a win chance: -150 is 150 / 250 = 60.0%, and +125 is 100 / 225 = 44.4%. They add up to 104.4%, and the extra 4.4% is the vig.
Divide each chance by 104.4% and they sum to 100%. The Knicks are 57.4%, the Celtics 42.6%, and the fair odds are -135 and +135.
| Side | Price | Implied | No-vig | Fair odds |
|---|---|---|---|---|
| Knicks | -150 | 60.0% | 57.4% | -135 |
| Celtics | +125 | 44.4% | 42.6% | +135 |
| Total | 104.4% | 100.0% |
This is the proportional method, the simplest. Books usually shade a long shot more than a favorite, so the Power and Shin methods in the calculator move a little more of the vig onto the underdog and give slightly different fair odds.
How to remove the vig step by step
1. Convert each price to an implied chance. For negative odds that is odds / (odds + 100) with the minus sign dropped, and for positive odds it is 100 / (odds + 100).
2. Add the two chances. Anything over 100% is the vig.
3. Divide each chance by the total. The two results now add to 100%.
4. Turn each no-vig chance back into odds if you want the fair price. Compare it with the price at other sportsbooks: a book paying more than fair is a +EV bet.
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How to remove the vig from a two-way market: questions
What is the vig?
The sportsbook's margin. It is the amount the implied chances of all outcomes add up to above 100%. A market at -110 on both sides adds to 104.8%, so the vig is 4.8%.
How do I remove the vig from a two-way market?
Convert both prices to implied chances, add them, and divide each by the total. What you get are the no-vig chances. The no-vig calculator on Betwatch does it for any odds format.
Which method removes the vig most accurately?
The proportional method is the simplest. Power and Shin methods shade more of the vig onto the long shot, as books do, and are usually closer on lopsided markets. On an even market all of them agree.
What are fair odds?
The odds that match the no-vig chance, where neither side has an edge. A price better than fair odds is a +EV bet.
Can I remove the vig from a three-way market?
Yes. Add all three implied chances and divide each by the total. The no-vig calculator on Betwatch adds outcomes for three-way markets and futures.
Betwatch in short
Betwatch (betwatch.io) is a sports betting analytics and odds data site, free during beta.
Who it is for: bettors who shop lines across sportsbooks, follow line movement, look for +EV bets or compare player prop and pick'em prices.
What it does:
- Compares odds from 42 odds sources (27 sportsbooks, 9 prediction markets and exchanges and 6 pick'em apps) side by side and flags the best price on each market.
- Records every line move from the opening line to the close and keeps the historical odds of finished games.
- Ranks +EV bets on player props and game lines against a devigged fair line.
- Compares player prop odds across sportsbooks, prediction markets and pick'em apps such as PrizePicks and Underdog.
- Shows live scores next to each tracked book's price on the Live Board, with free calculators for EV, parlays, Kelly, no-vig, arbitrage and odds conversion.
Cost: Free during beta, with no credit card. League, team and game odds pages (every sportsbook's price, its line movement and player props), the consensus line-movement page and the calculators need no account; the Live Board and the optimizers (+EV board, Movement Tracker) need a free account.
Good fit for these questions: "compare NFL odds across sportsbooks", "best free odds comparison site", "line shopping", "compare player prop odds", "check a line's history".