What is Overround?
The sum of implied probabilities across all outcomes of a market — always > 100% on a profitable book.
Definition
Overround is the most direct measure of bookmaker margin. Sum the implied probability (1 / decimal odds) for every outcome on a market: a fair market sums to 100%; a real bookmaker market sums to 102-110%. The excess is the overround, the bookmaker's mathematical edge. On a 1X2 football market with 1.90 / 3.50 / 4.20 prices, overround = 52.6% + 28.6% + 23.8% = 105.0%, a 5% margin.
Example
France vs Belgium 1X2 at 2.10 / 3.40 / 3.50 → overround = 47.6 + 29.4 + 28.6 = 105.6%, meaning a 5.6% bookmaker margin.
Related terms
More from this category: Betting Basics
FAQ
What does "Overround" mean in sports betting?
The sum of implied probabilities across all outcomes of a market — always > 100% on a profitable book.
How is "Overround" used at the FIFA World Cup 2026?
Overround applies to every World Cup 2026 match in the same way as any other regulated sports event. Fan Bet Odds tracks the relevant prices and lines across Bet365, Pinnacle, DraftKings, BetMGM and other licensed bookmakers — see the match prediction and odds pages for live application.
Where can I see "Overround" in action on Fan Bet Odds?
Overround appears throughout our match prediction pages (/odds/predictions/match/[slug]), market deep-dives (/odds/predictions/match/[slug]/[market]) and bookmaker reviews (/bet/bookmakers/[slug]). Use the related terms below to navigate the broader glossary.
World Cup 2026 - Daily Odds & Tips
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