Home › Glossary › Overround (vig)
The overround, or vig, is the amount by which a bookmaker's implied probabilities add up to more than 100%; it is the bookmaker's built-in margin.
Prediction-market prices on all outcomes add up to about 100%, and fees are charged separately; converting sportsbook odds lets you compare the two on the same scale.
Implied probability · Moneyline · Expected value (EV)
Prediction-market prices on all outcomes add up to about 100%, and fees are charged separately; converting sportsbook odds lets you compare the two on the same scale.
Polymarket View is independent and not affiliated with Polymarket. Educational information, not financial advice. All terms · Polymarket odds today