Remove sportsbook vig from 2-way or 3-way odds to get fair odds, implied probabilities, and market hold, with six devig methods side by side.
Upside's tools use probit, so one book's fair odds here match the tools. It moves every side the same distance on a bell-curve scale, which trims longshots more than favorites.
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Sportsbooks build vig, juice, or hold into listed odds, which makes the total implied probability across all outcomes exceed 100%.
A no-vig calculator removes that margin so the outcomes total 100% again. That gives you a cleaner reference price for each side before you compare it with live sportsbook prices. There is more than one way to split the margin between the sides, so this calculator runs six devig methods and shows them side by side. It defaults to probit, the method Upside's tools use, so one book's fair odds here match what the tools show.
Worked example, a standard two-way market at -110 on both sides. Each side implies 52.38%, so the market totals 104.76%. The vig is that 4.76% above 100. Every method puts both sides back at 50.0%, a fair price of +100. You are paying -110 for a coin flip.
Worked example with an uneven market, -140 against +120. Those imply 58.33% and 45.45%, totalling 103.79%, so the hold is 3.79%. Probit puts the fair prices at -130 and +130. The multiplicative method, which divides each side by the total, says -128 and +128. The methods agree near even money and drift apart as a market gets more lopsided. At +350 against -559, the longshot's fair price is +441 by probit and +382 by multiplicative.
Three-way markets, such as soccer 1X2 where a draw is its own outcome, work the same way but carry more hold because there are three prices to pad. Take +150, +230 and +180. Those imply 40.00%, 30.30% and 35.71%, totalling 106.02%, so the vig is 6.02%, noticeably above the two-way example. Probit puts the fair prices at +164, +252 and +197. Any market with more than two outcomes can be de-vigged this way, including three-way moneylines and multi-runner fields.
No-vig odds are a reference price, not a guarantee. Verify house rules, line freshness, limits, and market availability before deciding whether a listed number deserves more review.
Every method agrees on an even market. They split apart on lopsided prices. At +350 against -559, the longshot's fair price runs from +382 to +474 depending on the method. Probit is the default because it is the method behind the fair prices in Upside's tools. Which devig method is most accurate? scores them against 64,670 settled two-way markets.
Upside's tools use probit, so one book's fair odds here match the tools. It moves every side the same distance on a bell-curve scale, which trims longshots more than favorites.
fair = Φ(Φ⁻¹(implied) + c), with c set so the fair chances total 100%
The standard method. It divides each implied probability by the total. It is exact near even money, then understates heavy favorites and overstates longshots.
fair = implied ÷ total implied
It takes the same number of points off every side. It can't price a market where a longshot's share of the vig is bigger than its implied probability.
fair = implied − (total implied − 100%) ÷ number of outcomes
It raises every implied probability to the same power. On a two-way market it makes the biggest correction to longshots of any method here.
fair = implied^k, with k set so the fair chances total 100%
It treats the vig as the book's protection against bettors who know more. On a two-outcome market it gives the same fair odds as additive.
fair = (√(z² + 4(1 − z) × implied² ÷ total implied) − z) ÷ 2(1 − z), with z set so the fair chances total 100%
It divides each side's odds ratio, implied probability ÷ (1 − implied probability), by the same factor. It lands close to probit, about 0.05 points apart on a 90% favorite.
fair = implied ÷ (c × (1 − implied) + implied), with c set so the fair chances total 100%
On overs, beating a sportsbook's close was only 33% real across 100,000+ graded props. The over tax by book, sport and stat, and whose close to trust.
A crossed market is two prices adding up to under 100 percent. See the Chiefs -350 opening line that crossed Novig and FanDuel, with the math and results.
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