Calculate the bookmaker's margin (overround) for any market. See fair odds and true probabilities with the margin stripped out.
For every £100 wagered across all outcomes, the bookmaker keeps ~£6.20
| Outcome | Offered | Fair Odds | Implied % | True % |
|---|---|---|---|---|
| Home | 1.90 | 2.02 | 52.6% | 49.6% |
| Draw | 3.50 | 3.72 | 28.6% | 26.9% |
| Away | 4.00 | 4.25 | 25.0% | 23.5% |
The bookmaker margin (or overround) is the profit the bookmaker builds into their odds. If the implied probabilities of all outcomes sum to more than 100%, the difference is the margin.
Fair odds are what you'd get with zero margin — the true value of each outcome. By comparing offered odds to fair odds, you can see exactly how much value the bookmaker is taking from each side.
Lower margins mean better value for bettors. Sharp bookmakers like Pinnacle typically run 2-3% margins, while recreational bookmakers can go above 8%. Always compare margins across bookmakers before placing a bet.