What the bookmaker keeps, sport by sport

Average margin built into head-to-head odds, cents in the dollar, measured across 53 bookmakers on 26 September 2026. NFL is the cheapest sport to bet on; T20 cricket is the dearest.

Bar chart of average bookmaker margin by sport, from 4.4 percent for the NFL to 6.9 percent for T20 international cricket.

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Daily-updated data (CC BY 4.0) and method: betbetter.world/studies/margin-index

Chart: Bet BetterSource: Bet Better Margin IndexGet the dataCreated with Datawrapper