What is the bookmaker margin, or vig, in soccer betting?
Bookmaker margin, also called the vig or juice, is the built-in edge a sportsbook adds to its odds. It shows up as a total implied probability above 100% across all outcomes in a market.
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In a fair market, the implied probabilities of every outcome would add up to exactly 100%. Sportsbooks shade their prices so the total is higher, and the excess is their margin. Lower margins mean better prices for bettors over many bets.
For example, an over/under 2.5 market priced at 1.91 (-110) on both sides has implied probabilities of about 52.4% each, for a total of 104.8%. The margin is roughly 4.8%. A 1X2 market of 2.10, 3.40 and 3.60 also totals about 105%.
Margins are usually higher on niche markets such as correct score, corners and cards than on main lines, and they stack up in parlays. Adding up a market's implied probabilities is a quick way to judge it. Because the margin works against the bettor over time, it is one more reason to keep stakes modest.
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Related terms
Implied probability · Decimal odds · Value bet · Closing line value (CLV) · Parlay (accumulator)
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