We calculated the margin for Betfair by analyzing the odds they offer. We further ranked them in one of the following three categories:
From 1% to 5%: Good value
Over 5% to 7%: Average value
Over 7% to 10%: Poor value
We got our results by taking into account the odds for final result outcomes measured in line with the over / under for different football leagues. Getting the average results using this method, we were able to obtain the margins for each league and the overall betting margin for the bookmaker.
Betfair has an overall average margin of 6.39% for football and falls in the normal category. In the first section with Premier League and Championship, the margin is at 6.41%. The second section with Spanish La Liga and Italian Serie A, the margin is at 6.29%. Finally, taking the English Football League One, Austrian Bundesliga and Polish Ekstraklasa into account, the margin is at 6.47%.