Free Calculator

No-Vig Fair Odds Calculator

Strip the sportsbook's commission and see what the line really says. Enter both sides of any market to instantly reveal the true implied probability and fair odds for each team.

Side 1 Odds (American)
e.g. -110, +130, -200
Side 2 Odds (American)
Enter the other side's line

How No-Vig Odds Work

Every sportsbook builds a margin (juice or vig) into their lines so that the sum of implied probabilities exceeds 100%. Removing that excess gives you the fair odds — what the line would be in a zero-commission market.

Implied Prob₁ = 1 / Decimal₁ Implied Prob₂ = 1 / Decimal₂ Total = Implied Prob₁ + Implied Prob₂ Vig % = (Total − 1) × 100 Fair Prob₁ = Implied Prob₁ / Total Fair Prob₂ = Implied Prob₂ / Total Fair Decimal₁ = 1 / Fair Prob₁ Fair American₁ = convert Fair Decimal₁

Example

A standard -110/-110 market:
Implied probs: 1/1.909 + 1/1.909 = 0.5238 + 0.5238 = 1.0476
Vig = (1.0476 − 1) × 100 = 4.76%
Fair prob each side: 0.5238 / 1.0476 = 50.0% exactly
Fair odds: -100 / +100 (a coin flip — which is what a balanced market says)

Why No-Vig Matters

When you see -110 on both sides, it looks like an even game. But the sportsbook's implied probability says each team has a 52.38% chance — impossible, as probabilities must sum to 100%. The no-vig price removes that fiction and shows you the book's actual opinion: 50/50.

This matters most on asymmetric markets. A -170/+145 line looks like a big favorite — but strip the juice and you might find the fair line is closer to -155/+155, meaning the underdog at +145 is actually priced slightly above fair value.

Using No-Vig to Find Value

Compare the no-vig fair odds at one book to the raw line at another. If Book A's fair line for Team A is -140, and Book B is offering +150 — that's a +EV bet even after juice. The no-vig price is your reference point for shopping lines across sportsbooks.

Sibyl Does This For Every Game

Our models build true probability estimates from historical data, matchup analysis, and real-time signals — then compare against no-vig market prices to surface genuine edges.

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