No-Vig Fair Odds Calculator
The vig (or juice) is the small margin a sportsbook builds into its lines to guarantee profit over the long run. Stripping the vig reveals the true probability the book is pricing. Compare the no-vig number against your own estimate or against another book's no-vig number to find value.
Result
How vig removal works
A standard -110/-110 line (decimal 1.909/1.909) implies 52.38% on each side. The two probabilities
sum to 104.76%, with the extra 4.76% representing the vig. To strip the vig, divide each implied
probability by the sum: 52.38 / 104.76 = 50% on each side. The fair odds at 50%
probability are exactly +100 (decimal 2.00).
Why this matters
No-vig fair odds give you the book's true read on a market. Comparing no-vig prices across multiple books reveals where the market is moving fastest and which book is sharpest. If your own estimate shows higher win probability than the consensus no-vig number, that bet has positive expected value.
When the inputs are not symmetric
The calculator works for any two-way market, not just symmetric -110 lines. Plug in a moneyline pair like -150 / +130 and the no-vig odds reveal the book's true read on the favorite vs. underdog probability split.
Frequently Asked Questions
What does 'no-vig' mean in sports betting?
No-vig (or fair) odds strip the sportsbook's margin from a two-way market. The book builds vig into both sides so the implied probabilities sum to over 100%. Stripping the vig reveals the book's true read on each side, which sums to 100%.
How do I find positive EV using no-vig odds?
Compare your own win probability estimate against the no-vig fair probability. If your estimate is higher, the bet has positive expected value. The bigger the gap, the bigger the edge. For market-following bettors, compare no-vig prices across multiple TN books to find where the sharpest book stands.
Does this calculator work on moneylines and totals?
Yes. It works on any two-way market: spread, moneyline, total, race to X, both teams to score, head-to-head player props. Input the prices on each side and the calculator strips vig from both.
What's the typical vig at TN sportsbooks?
Standard -110/-110 spreads carry ~4.5% vig. Moneylines on tight games (-150 / +130) carry ~3 to 4% vig. Player prop markets often carry higher vig (8 to 15%) because of thinner pricing. World Cup futures can have 30 to 50% combined vig because of dozens of teams.
Can I use this for three-way markets?
No. This calculator is for two-way markets only. Three-way markets (soccer 1X2 with draw, NHL 3-way) require a separate calculation that divides three implied probabilities by their sum.