Glossary · 18+
Overround (margin)
The sum of implied probabilities in a market above 100% — the bookmaker's built-in edge.
Overround is how much a book adds up over 100% when you convert every price to implied probability. A race that sums to 120% has a 20% overround.
Quick maths
Implied % ≈ 100 / decimal odds. Add them up across the field. Use the odds converter per price.
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