Vig
Vig — short for "vigorish" — is the cut a sportsbook builds into a two-sided price, measured as how far the two sides' implied probabilities add up past 100%.
Worked example
A -110/-110 market implies 52.38% on each side. Add the two together and the total is 104.76% — the 4.76% past 100% is the vig.
Right now on BeatVig
Right now, across 2197 live two-sided quotes BeatVig prices, the typical sportsbook charges 7.64% vig and the typical prediction-market spread is 8.00%.
In short
Vig — short for "vigorish" — is the cut a sportsbook builds into a two-sided price, measured as how far the two sides' implied probabilities add up past 100%. A -110/-110 market implies 52.38% on each side. Add the two together and the total is 104.76% — the 4.76% past 100% is the vig.
Vig — FAQ
What is vig in betting?
Vig (vigorish) is the margin a sportsbook builds into a two-sided price, measured as how far the two sides' implied probabilities add up past 100%. A -110/-110 market carries 4.76% of vig by this measure.
Is vig the same as juice?
Yes. Vig and juice are the same measurement under two different names — the sportsbook's built-in margin on a two-sided price.
How is a sportsbook's vig different from a prediction market's fee?
At a sportsbook, vig is built into the price and charged whether the bet wins or loses. At a prediction market like Kalshi or Polymarket, the price can sit close to fair and the venue charges its own trading fee separately, on top of the trade.
Where can I see the vig at every book right now?
BeatVig's Vig by Book page measures the live median vig at every sportsbook it tracks, and the median spread at every prediction market, off the current board.