Parlay calculator: every leg, one price.

A parlay pays the product of its legs, and so does the book's margin. One bet at -110 on a true coin flip loses about 4.5% of the stake on average. Chain three of them and the ticket pays +596 where the fair price is +700: about 13% of the stake, on average, for the same three coin flips. The bigger the payout on the slip, the more of it is margin.

The calculator shows both numbers once it has both sides of each market. The offered price is what the slip says; the fair price is what the legs are worth with the vig stripped. A parlay is only better than its legs when a leg's own price is wrong. How Whet's parlay board works.

How are parlay odds calculated?

Convert each leg to decimal odds and multiply them. Three legs at -110 are 1.909 each, so the parlay is 1.909 x 1.909 x 1.909 = 6.96, which is +596 in American odds. A $10 stake returns $69.58, a profit of $59.58. The calculator runs that live as you type.

Why do parlays lose more than single bets?

Each leg carries the book's margin, and the margins multiply. A single -110 bet on a coin flip gives up about 4.5% of the stake on average. Three -110 legs on three coin flips pay +596 when the fair price is +700, and the average loss is about 13% of the stake. Same legs, three times the margin.

What happens when a leg pushes?

At most US books a pushed leg drops out and the parlay is recalculated from the legs that remain, so a three-leg ticket becomes a two-leg ticket. Tick 'Pushed' on the leg and the calculator does the same. Some books grade a whole parlay as a loss when a leg pushes; the house rules page of your book says which.

Does a same-game parlay pay the same as this?

No. The calculator multiplies the legs as independent bets, which is how a cross-game parlay pays. When legs move together (a quarterback's passing yards and his receiver's receiving yards), the book shortens the combined price, so the same-game number on your slip is lower than the multiplication. That shortening is the book pricing the connection, not a discount.

How do I tell whether a parlay is worth it?

Enter the other side of each market. The calculator strips the vig from each leg, multiplies the fair chances, and shows the fair payout beside the offered one. The gap is what the book keeps. A parlay only beats its legs when a leg's own price is wrong against the market.