Calculator
No-Vig Fair Odds Calculator — Strip the Juice
Sportsbooks inflate both sides of a market to guarantee their profit — the vig. Fair odds are what both sides would be priced at if the book took zero cut. Enter both sides of any two-way market to see the true probability and fair price.
Fair odds are your benchmark: if any book offers better than the fair price shown, that side is +EV and worth considering.
Check a book's hold on this market →One side of the market (e.g. the favorite at -150)
The other side of the same market at the same book
How this works
Formula
fair_prob_A = implied_A / (implied_A + implied_B)
Worked example
-110 / -110 → both 52.38% → fair = 52.38% / 104.76% = 50% on each side.
FAQ
Why strip the vig?
Vig-free prices estimate the true probability the market believes. They're the baseline for spotting +EV bets and comparing books.
Which de-vig method should I use?
Multiplicative (what this calculator uses) is the default. Additive and power methods exist for asymmetric markets like heavy favorites.
Are no-vig prices the 'true' price?
They're the market's best estimate at that moment. The sharpest no-vig prices come from Pinnacle and Betfair Exchange.
How do I use the fair price?
Compare it to the best price you can find at retail books. Bigger gap = bigger +EV.
Does this work for three-way markets?
Yes — use the three-way version in the formula card. Standard for soccer 1X2 and fight method-of-victory.