Vig & No-Vig Calculator
Strip the bookmaker margin and reveal the fair odds.
| Outcome | Odds | Implied | Fair odds | Fair % |
|---|---|---|---|---|
| Outcome 1 | 1.91 | 52.36 % | 2.00 | 50.00 % |
| Outcome 2 | 1.91 | 52.36 % | 2.00 | 50.00 % |
How it works
Every price carries an implied probability of 1 ÷ odds. Add them across all outcomes and a fair market would total exactly 100%. Bookmakers shade the prices so the total exceeds 100% — that excess is the margin (overround, or vig).
Removing the vig rescales each implied probability so they sum back to 100%, giving the bookmaker's true estimate of each outcome. Compare those fair odds with another book's actual price to spot value.
Vig & No-Vig Calculator
The vig (also called the juice, margin or overround) is the bookmaker's built-in edge baked into every price. This free vig calculator adds up the implied probabilities of a market, shows you exactly how big the margin is, and strips it out to reveal the fair no-vig odds and probabilities behind the line.
What is the vig?
Each decimal price implies a probability of 1 ÷ odds. In a fair market those implied probabilities across all outcomes would add up to exactly 100%. Bookmakers shorten the odds so the total comes out above 100% — that surplus is the margin. On a typical two-way market it might be 4–6%; on lower-quality books it can be far higher.
Because the probabilities are inflated, the displayed odds always pay slightly less than the true chance of the outcome. That gap is how the book profits regardless of who wins.
No-vig (fair) odds
Removing the vig rescales every implied probability so they sum back to exactly 100%. The result is the bookmaker's true assessment of each outcome, expressed as a fair probability and fair odds with no margin attached.
No-vig odds are the benchmark for finding value: if another bookmaker offers a price longer than the fair odds from a sharp book, that bet is +EV. Sharp-book no-vig lines are one of the most reliable probability estimates available.
How to use the vig calculator
Enter the decimal odds for each outcome — two for a moneyline or totals market, three for a market with a draw such as football 1X2. The calculator shows the total margin, the theoretical payout, and a table of fair odds and probabilities for every outcome.
How do you calculate bookmaker margin?expand_more
Add up 1 ÷ odds for every outcome and subtract 1. For example odds of 1.91 and 1.91 give 0.524 + 0.524 = 1.048, a margin of 4.8%.
What are no-vig odds?expand_more
Fair odds with the bookmaker margin removed, found by rescaling the implied probabilities to sum to 100%. They represent the book's true estimate of each outcome's chance.
What is a normal vig?expand_more
Sharp books run around 2–4% on main markets, standard books 4–7%, and soft or exotic markets often 8% or more. Lower margin means better value for the bettor.
How do no-vig odds help me find value?expand_more
Use the no-vig odds from a sharp bookmaker as your probability estimate. If another book offers longer odds than those fair odds, the bet has positive expected value.