House Edge vs Overround
What each means, how they relate, and when to use which.Both are the built-in advantage that makes the operator money, just in different products. House edge is the casino's mathematical edge on a game; the overround is the sportsbook equivalent, built into the odds. Same idea (the operator's cut), applied to casino games versus betting markets.
The house edge is the built-in mathematical advantage that ensures a casino keeps a percentage of every amount wagered over the long run.
Use it when Use house edge for the casino's advantage on a game.
Full definition of House Edge →The bookmaker's built-in margin, visible when the odds across all outcomes of a market imply probabilities that add up to more than 100%.
Use it when Use overround for the sportsbook's advantage built into the price.
Full definition of Overround →The key distinction
- House edge applies to casino games; the overround applies to betting odds.
- House edge comes from game rules and payouts; the overround comes from shading the odds.
- House edge is a share of the amount staked; the overround is the excess of implied probabilities over 100%, and the matching share of stakes (the theoretical hold on a balanced book) is 1 − 1 ÷ the book total (4.55% at -110 on both sides).
Common questions
What's the difference between House Edge and Overround?
Both are the built-in advantage that makes the operator money, just in different products. House edge is the casino's mathematical edge on a game; the overround is the sportsbook equivalent, built into the odds. Same idea (the operator's cut), applied to casino games versus betting markets.
What is House Edge?
The house edge is the built-in mathematical advantage that ensures a casino keeps a percentage of every amount wagered over the long run.
What is Overround?
The bookmaker's built-in margin, visible when the odds across all outcomes of a market imply probabilities that add up to more than 100%.
More term comparisons
Understanding, not advice. This explains how two terms differ so you can read the industry clearly. Nothing here treats gambling as a way to make money; the maths favours the house. 18+.