Calculator
No-Vig Calculator for Two-Way Odds
Use this no-vig, or devig, calculator to remove the quoted margin from both sides of a complete two-way market and estimate proportional fair probabilities.
Formula used
Fair probability = side implied probability / sum of both implied probabilities. Hold = sum of implied probabilities - 100%.
Worked example
-110 and -110 imply 52.38% each, 4.76% hold in total, and 50.00% normalized probability for each side.
When this calculator helps
Use this tool only with two opposing prices from the same complete two-way market and the same moment. It estimates proportional fair shares after removing the amount by which the two implied probabilities exceed 100%.
Do not combine one current price with a stale opposite price, or an Over at one total with an Under at another. Those inputs describe no real market and produce a misleading normalized result.
Understanding the result
This calculator uses standard multiplicative normalization. Each side keeps its proportional share of the combined implied probability after the amount above 100% is removed.
PickProof uses multiplicative normalization: each side's implied probability is divided by the sum of both implied probabilities. The hold output shows the quoted percentage above 100% before normalization.
This is one transparent vig-removal method, not a universal truth model. It also does not separately estimate push probability for whole-number spreads or totals.
Before relying on the output
- Both outcomes from one complete market
- Same sportsbook context and capture time
- Two-way market with no missing draw outcome
Common mistakes
- Entering two prices that are not opposing outcomes from the same market and moment.
- Using one side only and calling the result no-vig.
- Applying a two-way method to a three-way market.
Limitations
- Multiplicative normalization is a transparent estimate, not a universal model of true probability.
- It does not separately model push probability for spread or total numbers.
- Stale, mismatched, or incomplete prices make the result unreliable.
Frequently asked questions
Which vig-removal method is used?
PickProof uses multiplicative normalization on the two entered implied probabilities for this public tool.
Is this the same as a devig calculator?
Yes. Devig and no-vig describe removing the quoted market margin. This calculator uses both sides of one complete two-way market and discloses its multiplicative method.
Does this account for pushes?
No. A push-aware spread or total model requires market and point-specific information beyond two quoted prices.
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