No-vig fair odds calculator
Enter the odds on every side of a market to strip out the sportsbook's margin: each side's fair win probability and fair odds, and how much the book holds.
| Side | Odds | Implied | Fair win % | Fair odds | Fair decimal | Remove |
|---|---|---|---|---|---|---|
| 1 | ||||||
| 2 |
How it works
The vig
At -140 / +120, the implied probabilities are 58.3% and 45.5%: 103.8% in all. The extra 3.8%, the overround, is the book's margin, often called the vig or juice. Fair odds have no margin, so their probabilities add up to exactly 100%.
How the vig is removed
Each side's implied probability is divided by the market total, so the margin comes off in proportion: 58.3% ÷ 103.8% = 56.2% fair for the favorite, 43.8% for the underdog. It's the simplest and most common method; others (power, Shin) take a little more of the margin from the longshot.
Hold
What the book keeps, in theory, if it takes bets on every side in proportion to the prices: 1 − 1 ÷ market total. At -140 / +120 that's 3.65%; at -110 / -110 it's 4.55%. Player props and futures usually hold much more.
Using fair odds
A sharp market's no-vig price is a decent estimate of the true chance. If another book offers better than that fair price, the bet has positive expected value: see the EV calculator. On BetSharp, SharpModels' win probabilities are compared against the market's no-vig win %.
More calculators
All calculators →For information only: check every figure with your sportsbook or exchange before you bet. Calculators can't make a bet a good one, and only bet what you can afford to lose.