What the vig means

The vig — short for vigorish, and also called juice — is the commission a bookmaker builds into its odds. It is the reason a genuine 50/50 market never pays a fair 2.00 on each side. The book shades both prices, so the total implied probability adds up to more than 100%, and that extra slice is its edge.

Vig is the American-flavoured term for the same thing UK bettors call the margin or overround. Whatever the name, it is how bookmakers profit regardless of who wins.

A worked example

Take a classic two-way market priced -110 / -110 (about 1.91 / 1.91 in decimal):

  • Each -110 price implies roughly a 52.4% chance.
  • Two sides at 52.4% total 104.8% — that extra 4.8% is the vig.

Now imagine 100 bettors stake £110 each, split evenly. Whichever side wins, the book pays winners £100 profit each but keeps the losers’ £110 stakes. Across the two sides, the operator nets roughly 4.5% of total stakes no matter the result. Our margin calculator turns any set of prices into the exact vig percentage, and our odds tools convert between American, decimal and fractional.

When and why it matters

The vig is present in every bookmaker market — match odds, spreads, totals, props and especially multiples. It matters because:

  • It is the house edge. Over enough bets, the vig is what grinds most bettors into a loss even when they pick winners at a fair rate.
  • It varies wildly. A sharp, low-margin book might price a market at 102%; a soft book or a big accumulator can be 115% or far more. See best low-margin bookmakers.
  • It compounds in multiples. Every leg of an acca carries its own vig, so combining selections multiplies the edge against you.

The honest downside

Here is the blunt truth: the vig means you are not paid fair odds. A coin flip that should pay 2.00 pays 1.91. To break even, you must win more often than the fair price implies — you are climbing uphill from the first bet.

You cannot remove the vig, but you can shrink it:

  • Shop the line. Betting the best available price on every selection is the single biggest edge available to a recreational bettor — see what is line shopping.
  • Use low-margin books. Smaller vig means more of your correct calls turn into profit.
  • Avoid high-vig products. Big accumulators, exotic props and enhanced-but-restricted offers usually carry the steepest juice.

Understanding the vig is the difference between betting with your eyes open and quietly funding the operator.

Compare margins and prices across our best betting sites, and use the margin calculator before you bet. Keep staking sensible with our responsible gambling tools.

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