No-vig fair odds calculator
Fair odds are the odds with the bookmaker margin (the vig) taken out. Add the implied probabilities of every outcome, then scale them back to 100% — what is left is the market’s fair price.
Updated 19 October 2026 · Free, no sign-up. All calculations run in your browser. 18+ · Play responsibly.
How it works
- Enter the odds of every outcome from one bookmaker.
- The calculator measures the margin and removes it in proportion to each price.
- Use the fair odds as a benchmark: a price above them at another bookmaker is value.
The formula
Margin = Σ(1/odds) − 1 · Fair probability = (1/odds) ÷ Σ(1/odds) · Fair odds = 1 ÷ fair probability
Worked example
A 1X2 market at 2.50 / 3.40 / 2.90: 0.400 + 0.294 + 0.345 = 1.039, a margin of 3.9%. Fair odds become 2.60 / 3.53 / 3.01. Any bookmaker paying more than 2.60 on the home side offers value.
How Pattern90 uses this
Pattern90 starts every match from Pinnacle’s price with the margin removed — the sharpest reference in football — and combines it with recent form to set its own fair odds. See the result for today’s matches on the Match Analysis page.
FAQ
Why use a sharp bookmaker’s odds?
Sharp bookmakers such as Pinnacle have low margins and adjust quickly to informed money, so their no-vig price is a strong estimate of the true chance.
Is this the only way to remove the margin?
This calculator uses the proportional method, the most common one. Other methods spread the margin differently, especially on long shots, but give similar results for typical football prices.