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Devig & No-Vig Calculator

Bookmaker odds always imply more than 100% combined probability. The excess is the vig, the book's built-in margin. De-vigging removes it to reveal the market's actual opinion: the fair probability and fair odds of every outcome.

Unlike most free calculators, this one runs four de-vig methods (multiplicative, additive, power and Shin) on 2- and 3-way markets, and shows them side by side. Shin is the bias-corrected method the BetEdge engine applies to Pinnacle's odds to build its fair-value baseline: de-vig a sharp book's line and you get the best public estimate of true probability; compare another book's price against it and the gap is a measured mispricing.

De-vig method

Attributes part of the margin to informed money (concentrated on longshots) and removes it — the bias-corrected method BetEdge's engine uses by default.

Bookmaker overround (vig)

4.81%

OutcomeImplied %Fair %Fair odds
Home47.62%45.87%2.180
Draw29.41%27.87%3.588
Away27.78%26.26%3.808

All methods compared: fair odds

OutcomeShinMultiplicativePowerAdditive
Home2.1802.2012.1732.173
Draw3.5883.5633.5973.596
Away3.8083.7733.8193.820

The proportional (multiplicative) method over-prices longshots; Shin, power and additive each correct that bias differently. Where they disagree most is exactly where a “phantom edge” can hide.

How to use the No-Vig Calculator

  1. 1

    Choose the market type: 2-way (tennis, totals, spreads) or 3-way (football 1X2).

  2. 2

    Enter the decimal odds for every outcome of the SAME market at the SAME bookmaker.

  3. 3

    Pick a de-vig method (Shin (default), multiplicative, power or additive) or read the 'all methods compared' table to see where they disagree.

  4. 4

    Read the overround (the book's margin) and the de-vigged fair probability and fair odds per outcome.

Worked examples

Example 1: the standard -110 / -110 line

Both sides at decimal 1.91: implied probability 52.4% each, summing to 104.8%. The 4.8% excess is the vig. De-vigged, each side is exactly 50%, fair odds 2.00. You are paying 1.91 for something worth 2.00; that gap is the cost of betting random sides.

Example 2: football 1X2

Home 2.10, Draw 3.40, Away 3.60: implied 47.6% + 29.4% + 27.8% = 104.8%. Proportional de-vig gives fair probabilities of roughly 45.4% / 28.1% / 26.5% and fair odds of 2.20 / 3.56 / 3.77. If another book offers the home side at 2.25 while the fair price is 2.20, that 2.3% gap is the kind of mispricing our edge screen flags.

The four de-vig methods

The proportional (multiplicative) method is the standard reference, but it systematically over-prices longshots (the favorite-longshot bias) which manufactures phantom edges on deep underdogs. The other three correct that bias in different ways. When they disagree on an outcome, that's exactly where a “value” bet is most likely to be a bias artefact rather than a real mispricing.

Shin

Attributes part of the margin to informed money (concentrated on longshots) and removes it — the bias-corrected method BetEdge's engine uses by default.

Multiplicative

The standard reference: scale every implied probability down in proportion until they sum to 100%. Simple, but over-prices longshots.

Power

Raises each implied probability to a single exponent until they sum to 100% — shrinks longshots harder, correcting the favorite-longshot bias.

Additive

Removes an equal absolute share of the margin from each outcome. Takes a bigger relative bite out of longshots than the multiplicative method.

FAQ

Devig Calculator FAQ

What is vig (juice / overround)?
Vig is the bookmaker's margin baked into the odds. If you convert every outcome's odds to implied probability and add them up, the total exceeds 100%. That excess is the overround. A standard -110/-110 line (decimal 1.91/1.91) sums to about 104.8%, meaning the book charges roughly 4.8% on that market regardless of which side wins.
How does the no-vig (de-vig) calculation work?
De-vigging removes the bookmaker margin to recover the fair probability each price implies. The simplest method is proportional (multiplicative): divide each outcome's implied probability by the sum of all implied probabilities so the rescaled 'fair' probabilities add to exactly 100%, then fair odds are 1 divided by the fair probability. This calculator also runs three bias-corrected methods side by side so you can see where they disagree.
Which de-vig method should I use: multiplicative, additive, power or Shin?
Multiplicative is the standard reference but it systematically over-prices longshots (the favourite-longshot bias), which manufactures phantom edges on deep underdogs. The additive method removes an equal absolute share of the margin from each outcome; the power method raises each implied probability to a single exponent; and Shin attributes part of the margin to informed money concentrated on longshots. All three pull a longshot's fair probability below the multiplicative estimate. BetEdge's own engine uses Shin by default. A practical habit: if the methods disagree a lot on an outcome, treat any 'edge' there with suspicion: it's likely a bias artefact, not a real mispricing.
Why de-vig Pinnacle's odds specifically?
Pinnacle runs low margins, accepts sharp action and famously doesn't ban winners, so its de-vigged line is widely treated as the best public estimate of true probability. De-vigging a soft book's odds mostly recovers that book's opinion plus its bias; de-vigging Pinnacle approximates the market's sharpest consensus. That fair value is the baseline BetEdge compares every other bookmaker's price against.
What can I do with the fair odds?
Two things. First, compare: if another book offers higher odds than the fair odds, the gap is a measured mispricing (use our EV calculator to express it in money). Second, feed the fair probability into the Kelly calculator as your win-probability input for staking. Fair odds are an estimate, not a verdict. Small gaps are usually noise or stale lines.

BetEdge is an analytics and decision-support tool, not a bookmaker and not a tipster service. We don't accept bets or hold funds. For educational and informational purposes only. 18+.

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