What does no-vig mean in betting?

No-vig (or de-vig) means removing the sportsbook's built-in margin from a price. Books quote both sides so the implied probabilities add up to more than 100%; removing the vig rescales them back to 100% to reveal the fair, true odds.

How do you calculate no-vig fair odds?

Convert each side to implied probability, add them up to get the total (the overround), then divide each side's probability by that total. Convert the result back to odds to get the fair, no-vig price.

Why are no-vig odds useful?

The no-vig line from a sharp book like Pinnacle is the market's honest estimate of true probability. Comparing it to the price another book offers is the core method for finding positive expected value (+EV) bets.

No-Vig Calculator

Enter both sides of a market to strip out the sportsbook's vig and reveal the true, fair odds — the market's honest estimate, and the benchmark for finding value.

Calculator What is the vig? How to de-vig More calculators

Remove the Vig

Enter each side in American odds. We convert to probability, rescale to a fair 100%, and show the no-vig fair odds and probability for each outcome.

Side A odds

Side B odds

How to use it: take the no-vig fair odds for a side, then check if any book (or the opposite side elsewhere) is offering a better price. If it is, that's a positive-EV bet.

What is the vig?

The vig (short for vigorish, also called juice or the hold) is the sportsbook's built-in margin. A book quotes both sides of a market so the implied probabilities add up to more than 100% — that extra is their edge. A standard -110 / -110 market implies 52.4% + 52.4% = 104.8%, so the book holds about 4.5% no matter which side wins.

Those raw prices are not the book's true estimate of what will happen — they're padded. To find the market's honest opinion, you strip the vig back out. That fair, no-vig number is the single most useful reference point in sports betting.

How to de-vig a line

Convert each side's odds to implied probability (1 ÷ decimal odds).
Add the implied probabilities together — this total is the overround (e.g. 104.8%).
Divide each side's implied probability by that total to rescale back to a fair 100%.
Convert the fair probabilities back to odds. Those are your no-vig fair odds.

This is the standard "multiplicative" method the calculator above uses. For heavy favorites and longshots, sharper models (like the power method Odds Piranha uses internally) adjust for favorite-longshot bias, but simple de-vig is an excellent, transparent starting point for almost every market.

Why sharp bettors live by the no-vig line

The no-vig price from a low-hold, sharp book — Pinnacle or a betting exchange — is as close as you'll get to the true probability of an outcome for free. Every serious +EV strategy comes down to the same move: get the fair no-vig number, then hunt for a book offering better than it. Beat the fair line consistently and you win long-term.

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