Free no-vig calculator. Enter both sides of a market to remove the bookmaker margin and find the fair odds, fair probability, and the hold percentage.
The vig (juice) is the book's built-in margin. Add the implied probabilities of both sides and they total more than 100% — that overround is the edge. Removing the vig scales them back to 100% to reveal the fair price. A −110 / −110 market removes to 50% / 50% with about a 4.5% hold.
De-vigged market odds are one of the best free probability estimates available — feed the fair probability into an EV calculator to check for an edge elsewhere.
Convert both sides to implied probability, add them to get the overround, then divide each by that total so they sum to 100%. Convert back to odds for the fair price.
Standard −110 / −110 markets hold about 4.5%. Sharp books can be under 3%; props and parlays are much higher.