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Betting Academy Odds & MarketsHow Bookmaker Margins Work

Intermediate

How Bookmaker Margins Work

Why the odds always add up to more than 100% — and what that overround costs you on every bet.

10 lessons

Module lessons

1. What Is the Overround?
2. Calculating the Margin Step by Step
3. Why Margins Vary by Market
4. The True Odds vs the Offered Price
5. Comparing Margins Across Bookmakers
6. How Margin Destroys Long-Run ROI
7. De-Vigging: Deriving Fair Odds from a Market
8. Sharp Books vs Soft Books: Margin Profiles in Practice
9. Margin-Aware Market Selection
10. Using Margin Analysis to Hunt Value