Free tool
No-Vig / Fair Odds Calculator
Enter the odds on both sides of a two-way market. This strips out the bookmaker's margin (the vig) proportionally, so you can compare prices across books on a level footing.
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How this is calculated
Each side's implied probabilityis 1 ÷ decimal odds. The two implied probabilities sum to slightly over 100% — that excess is the vig. To remove it proportionally:
fair probability (A) = implied A ÷ (implied A + implied B)
This is the standard proportional method — simple and good enough for most comparisons. It isn't the only de-vigging method (Shin's method and others exist and can differ slightly on very skewed markets), but it's the one most bettors mean by "no-vig odds."
What this is useful for: comparing the same market across two bookmakers with different margins, or getting a cleaner probability baseline before estimating your own edge — see the Kelly & Value Calculatorfor the next step.
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