No-Vig Calculator
Every posted line has a fee baked in — the vig. Strip it out and you’re left with the fair probability the book actually believes. Paste both sides below; the fair no-vig line is computed live, every step shown.
Want the full animated derivation, step by step? Open the De-Vig tool in the app →
How the no-vig calculation works
A two-sided price doesn’t add up to 100% — on purpose. Convert each side to the probability it implies and they’ll sum to more than one. That excess is the vig:
To remove it, rescale the two implied probabilities so they sum to one. The simplest method is proportional — divide each by the total:
The power and Shin methods are more sophisticated: they shade the favorite and the longshot by different amounts to correct for favorite-longshot bias, which proportional normalization ignores. The calculator above lets you switch between all three.
Worked example
De-vigging is the first step in almost everything else: it’s how you find a +EV bet, build a sharp-consensus fair line, and measure closing line value. The full method, with worked examples and the animated derivation, is in how to de-vig odds.
Frequently asked questions
What is a no-vig calculator?
A no-vig calculator removes the sportsbook’s built-in margin (the vig or juice) from a two-sided price, leaving the fair probability and fair odds the line implies. You enter both sides; it returns the de-vigged probabilities that sum to 100%.
How do you remove the vig from odds?
Convert both sides to implied probabilities, then normalize so they sum to one. The simplest way is proportional (divide each by the total); the power and Shin methods shade the favorite and longshot differently to correct for favorite-longshot bias.
What is the vig?
The vig (vigorish, or juice) is the sportsbook’s margin, baked into the price so the two sides’ implied probabilities sum to more than 100%. That overround is the house edge on the market.