Free tool
Find a clear price reference: convert your probability estimate into fair odds or remove bookmaker margin from a complete market.
Remove bookmaker margin from a market or turn your probability estimate into fair odds. Compare that reference with available prices to investigate potential value.
Direct answer
Fair odds give you a break-even price from your probability estimate or a margin-free reference from bookmaker odds. Compare those references with the offered prices to explore potential value.
Calculator
Enter the decimal odds of a market and see the implied probability, the bookmaker's margin, the fair probability without margin, and the fair odds for each selection.
The no-vig calculation works best when the selections belong to the same market and the same line, cover the entire market, and do not overlap. Therefore, Double Chance is not included as a preset here.
| Selection | Bookmaker odd | Implied prob. | Fair probability without margin | Fair odds |
|---|---|---|---|---|
| Home | 2.10 | 47.62% | 45.05% | 2.22 |
| Draw | 3.30 | 30.30% | 28.67% | 3.49 |
| Away | 3.60 | 27.78% | 26.28% | 3.81 |
| What it calculates | Fair odds, margin-free probability, and bookmaker margin |
|---|---|
| Base formula | Fair odds = 1 ÷ probability |
| Best use | Compare the odds price with an estimated probability |
| Common mistake | Comparing fair odds without examining the estimate |
| How Predora helps | Shows Active Model probability, EV, and best odds per market |
Implied probability = 1 ÷ decimal oddsFair odds = 1 ÷ estimated probabilityFair probability without margin = implied probability ÷ sum of implied probabilitiesEV = (estimated probability × odds) − 1Edge = estimated probability − implied probabilityImagine a football game with odds of 2.10 for the home team, 3.30 for the draw, and 3.60 for the away team. The sum of implied probabilities exceeds 100% because the bookmaker builds margin into the odds. By removing that margin, the calculator shows the fair probability and fair odds for each outcome.
| Selection | Bookmaker odd | Implied prob. | Fair probability without margin | Fair odds |
|---|---|---|---|---|
| Home | 2,10 | 47,62% | 45,05% | 2,22 |
| Draw | 3,30 | 30,30% | 28,67% | 3,49 |
| Away | 3,60 | 27,78% | 26,28% | 3,81 |
| Concept | What it means | Formula |
|---|---|---|
| Implied probability | Chance embedded in the bookmaker's odds | 1 ÷ odd |
| Fair odds | Odds consistent with an estimated probability | 1 ÷ probability |
| EV | Expected value when comparing probability and odds | (probability × odd) − 1 |
| Edge | Difference between your probability and the bookmaker's probability | est. prob. − implied prob. |
On Predora.si, the fair odds logic appears in the Active Model reading. The model estimates a probability for the selected market, that probability becomes fair odds, and the platform compares that reading with the odds available at bookmakers. When the market odds are above the estimated fair price, there may be positive EV. The result gains context when compared with odds, Factors, and game data.
This reading connects with Upcoming Games with EV+, Upcoming Games, odds comparison, and AI + Statistics. Upcoming Games with High Probability organizes games by high chance, but that cut does not imply positive value if the odds are below the fair price.
Fair odds translate a probability estimate into a break-even price.
Always compare the same game, market, and line.
No-vig works best with mutually exclusive and complete outcomes.
Bookmaker odds almost always come with built-in margin.
High odds only have value if the estimated probability justifies them.
The price can disappear quickly.
Factors, market, form, home/away, and game data contextualize the calculation.
On Predora.si you see chance, EV, and best odds per market in football games, with Active Model, odds comparison, and Factors to contextualize the reading.
Explore Predora.siFair odds are the odds consistent with an estimated probability, without considering the bookmaker's margin.
Divide 1 by the decimal probability. Example: 60% becomes 1 ÷ 0.60 = 1.67.
They are the odds adjusted after removing the bookmaker's margin from a market.
Fair odds turn a probability estimate into a break-even price. Compare them with the offered odds to evaluate potential value.
Fair odds are the reference price; EV compares that price or probability with the odds offered.
Yes, as long as you enter the home, draw, and away odds from the same market.
The Active Model estimates probabilities per market, those probabilities generate fair odds, and help calculate EV when compared with the odds available.