Betfair Exchange: margins and market data
Across 1,422 markets observed in the last 7 days (8 sports, 37 leagues), Betfair Exchange's median bookmaker margin was 3.27% — rank #2 of 99 tracked books (lower is better for bettors). Where at least five books priced the same market, Betfair Exchange had the single best price 16.0% of the time.
| Market family | Median margin |
|---|---|
| Moneyline / match result | 3.81% |
| Handicaps / spreads | 4.51% |
The margin is the bookmaker's built-in fee: the amount by which its implied probabilities exceed 100%. A 3.27% margin means that, on a typical Betfair Exchange market, prices pay out 3.27% less than a fair-value book would. Omenizer's fair prices remove this margin using sharp reference sources — the methodology explains how.
See where Betfair Exchange beats fair value — free account