Fair Probability A
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No Vig Calculator
Remove vig from a two-sided betting market.
Fair Probability B
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No Vig Calculator: Remove the Sportsbook Margin
A no vig calculator removes the sportsbook margin from a two-sided market so you can see the implied fair probabilities. That is useful when you want to compare a price, estimate whether a line is fair, or sanity-check the market before placing a bet. If you are also modeling ad inventory costs, a CPM calculator complements the same “strip the markup” mindset, and marketplace shippers can cross-check fees with an eBay shipping calculator before they lock in a price.
Sportsbooks build a margin into both sides of the line, so the raw implied probabilities usually add up to more than 100%. Removing vig normalizes the market and makes the two sides easier to compare on their own.
How the Adjustment Works
The calculator converts each line into implied probability, adds them together, and then rescales each side so the total becomes 100%. That reveals the fair probability after the bookmaker’s margin is removed.
This matters because raw odds can hide the true shape of the market. A line that looks balanced may still be priced with a house edge. No-vig math helps you compare the market more honestly, but it does not predict outcomes.
Raw Implied Probability
Includes the sportsbook margin.
No-Vig Probability
Normalized to a fair 100% total.
That normalization is the main reason bettors use the tool.
Real-World Use Case: Comparing Lines
If one side of a market has better no-vig probability than another book’s line, that can help you spot value. It is also useful for tracking whether a line moved because of real market pressure or just because the book adjusted its margin.
The calculator gives you a cleaner comparison point, which is helpful when line shopping or reviewing odds across multiple sportsbooks.
Used correctly, it is a comparison tool, not a prediction engine.
Common Betting Math Mistakes
First: treating raw implied probability as fair probability.
Second: forgetting that sportsbook margin changes the total.
Third: assuming no-vig numbers guarantee a win.
Fair probability and outcome probability are not the same thing.
Reference Data Table
| Odds | Raw Implied | No-Vig |
|---|---|---|
| -110 / -110 | 52.38% / 52.38% | 50.00% / 50.00% |
| +150 / -170 | 40.00% / 62.96% | 38.80% / 61.20% |
| +200 / -240 | 33.33% / 70.59% | 32.06% / 67.94% |
These examples show how the margin is removed before comparing the two sides.
Frequently Asked Questions
What is vig?
The sportsbook margin.
Why remove it?
To compare fair probabilities.
Does this predict outcomes?
No. It only normalizes the market.
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