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No-Vig Fair Odds Calculator

No-vig odds are a market's prices with the sportsbook's margin stripped out, so the implied probabilities sum to exactly 100% — the market's honest opinion of the outcome, and the baseline every edge is measured against.

Total implied · overround1.0370 · 3.70%
Proportional-180 / +180
each probability ÷ their sum — the classic normalization · 64.3% / 35.7%
Additive-184 / +184
equal margin subtracted from each side · 64.8% / 35.2%
Power-186 / +186
p^(1/k) with k solved so probabilities sum to 1 — favorite-longshot aware · 65.1% / 34.9%

When all methods agree the fair price is robust; when they split, the edge depends on the devig model — treat it with less confidence.

Show the math
proportional: fairᵢ = pᵢ / ΣpΣp = 1.0370
additive: fairᵢ = pᵢ − (Σp − 1)/n
power: fairᵢ = pᵢ^(1/k), k solved so Σfair = 1

The Scout’s Notebook

What are no-vig (fair) odds?

No-vig odds are a market's prices with the sportsbook's margin stripped out, so the implied probabilities sum to exactly 100% — the market's honest opinion of the outcome, and the baseline every edge is measured against.

How it works & common questions

When the methods agree, the fair price is robust; when they split, your edge depends on the model — the calculator shows the disagreement instead of hiding it.

How it works

  1. Enter every side's price. Both sides of a two-way market, or all three of a 1X2.
  2. Read the overround. The amount the implied probabilities exceed 100% — the vig you are stripping.
  3. Compare the three fair lines. Proportional, additive, and power devig, each with fair odds per side.

Which devig method is most accurate?

The power method is generally preferred for markets with a favorite and a longshot because it removes proportionally more vig from the longshot, matching how books actually shade prices. On near-even markets all three methods agree almost exactly.

Learn more: Expected Value & De-Vigging (guide)

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