AI no-vig calculator: the fair odds hiding behind the book's price
devig calculator: enter both sides of any market and get the no-vig fair odds, the true implied probability of each side, and the hold the book is charging.
Nothing is worked out until you tap. Five runs a day, unlimited with a Velvet seat.
How it works
The two implied probabilities add up to more than 100%; the excess is the hold. Dividing each by the total removes the vig and leaves the fair probabilities.
More calculators: the Money Room · hedge · devig · parlay · Kelly · EV
About the devig calculator
A book's two prices add up to more than 100% implied probability, and the extra is the vig. Devigging removes it to find the fair, no-vig odds on each side. Enter both prices and the calculator returns each side's fair probability and fair American odds, plus the size of the vig.
What is the vig on -110 / -110?
About 4.5%. Each side implies 52.4%, 104.8% together, and the fair price on each side is +100.