Fair odds calculator
| Outcome | Offered | Implied % | True % | Fair odds |
|---|
—
Why the fair line matters more than the best price
Line shopping finds you the best available price; the no-vig line tells you whether even that price is any good. The two questions are different. A market can be shaded so heavily that the best of six books still sits below fair value — common on longshots, where the favourite-longshot bias concentrates the margin exactly where casual money goes.
The practical workflow sharp bettors use: take the no-vig probabilities from the sharpest market you can see, compare them against the price your book offers, and bet only where your book is generous relative to that fair line. It is value betting with the market itself as the model — no statistics degree required. Our margin research measures how much this varies by league, and the EV calculator turns the gap into an expected-value figure.
No-vig FAQ
The bookmaker margin baked into the odds. Sum the implied probabilities of every outcome in a market and you get more than 100% — the excess is the vig. A 1X2 market summing to 105.5% charges 5.5% before anything kicks off.
This tool uses the standard multiplicative method: each implied probability is divided by the market total, so they sum to exactly 100%, then converted back to odds. It assumes the margin is spread proportionally — the common convention, though books actually load more margin onto longshots.
They are the market’s honest probability estimate — the best free forecast available. Compare a price at your book against the no-vig line from a sharper market and you can see whether you are getting value without any model at all.
The no-vig line is what the market believes; our Poisson model is an independent estimate from results data. When they disagree meaningfully, that disagreement is exactly what our screener flags — one of the two is wrong, and the public record tracks which.