No-vig calculator

Also a vig or fair-odds calculator. Enter a market's prices to strip the bookmaker's margin and see the fair, no-vig odds and the margin-free implied probability for each outcome.

Enter every price in the market to remove the vig.

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How removing the vig works

Every decimal price implies a probability of 1 / odds. Add up those implied probabilities across a market and a bookmaker's will total more than 100%. The excess is the vig, juice or margin. This calculator scales the probabilities back to 100% and turns them into no-vig, fair odds.

No-vig is not the true probability

This is the trap worth understanding. Stripping the vig tells you the probability one book's line implies with its margin removed, not the real chance of the outcome. No single price reveals the true probability. A fair line you can trust means combining many bookmakers and weighing them, which is the difference between a quick de-vig and what KeenOdds posts.

Frequently asked questions

What is the vig, and what does a no-vig calculator do?

The vig, or juice, is the margin a bookmaker builds into its prices. It makes the outcomes' implied probabilities add up to more than 100%. A no-vig calculator removes that margin so the prices sum back to 100%, leaving the fair odds the book's line implies.

Does the no-vig price equal the true probability?

No, and this is the key point. Removing the vig gives the margin-free probability implied by one bookmaker's line. It is that book's opinion with the margin taken out, not the true probability, which nobody knows from a single price. A trustworthy fair line comes from combining many books.

How do I use this vig calculator?

Enter the decimal odds for every outcome of the market, two for a moneyline, three for 1X2. The calculator shows the total overround, the vig, and each outcome's no-vig fair odds and margin-free implied probability.

What is a fair odds calculator?

It is the same tool. Fair odds are what the price would be with no margin. This calculator reports the fair, no-vig odds for each outcome alongside the raw prices.

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