American odds are converted into implied probability before any margin is removed.
No-vig fair odds calculator
Remove the vig from a market.
Convert sportsbook prices into fair probabilities by removing the built-in margin. Start with two-way markets, then switch to three-way markets when a draw or third outcome matters.
Free calculator
No-vig fair odds calculator
Enter the sportsbook prices for every outcome in a market. The tool removes the overround and returns normalized fair probabilities and no-vig odds.
Market hold4.76%
Total implied104.76%
Fair total100%
Outcomes2
| Outcome | Book odds | Implied | Fair probability | No-vig odds |
|---|---|---|---|---|
| Outcome A | -110 | 52.38% | 50% | +1002.000 decimal |
| Outcome B | -110 | 52.38% | 50% | +1002.000 decimal |
fair probability = outcome implied probability / total implied probabilityHow it works
No-vig odds strip out the bookmaker margin.
Sportsbooks usually price a market so the implied probabilities add up to more than 100%. That extra percentage is the overround, often called vig or juice. A no-vig calculation normalizes every outcome back to a 100% market.
Each outcome's implied probability is divided by the total implied probability for all outcomes.
The normalized probabilities are converted back into no-vig American and decimal odds.
Formulas
- Implied probability: `1 / decimal odds`.
- Total implied probability: sum of all outcome probabilities.
- Market hold: `total implied probability - 100%`.
- Fair probability: `outcome implied probability / total implied probability`.
- Fair decimal odds: `1 / fair probability`.
Use it with context
No-vig odds are estimates, not predictions. They show the market's consensus after removing margin, but they do not account for news, limits, stale lines, promotions, or sportsbook-specific rules. Always check final terms before wagering.
Need payout math too?
Use the betting odds calculator to convert a stake and price into estimated profit, total return, decimal odds, and implied probability.