Parlay calculator.
Enter each leg, get the combined odds and payout. Then look at what the combined implied probability says about your chances.
How parlay odds are calculated
A parlay multiplies each leg's decimal odds together — every leg must win. Two -110 legs combine to +264, which implies about 27.5%. Books love parlays because the hold compounds with every leg you add.
When a parlay is worth the price
That doesn't make every parlay wrong. It makes the price the thing to check: if the legs are correlated or each leg is independently +EV, the multiplication can work for you instead of against you. Big Mike's engine prices each leg against no-vig fair value before it ever suggests one.
Common questions
How are parlay odds calculated?
Convert each leg to decimal odds and multiply them together, then convert back. Two -110 legs: 1.909 × 1.909 = 3.645, which is +264 in American odds.
Why do sportsbooks push parlays so hard?
Because the book's hold compounds with each leg. A standard -110 leg carries about 4.5% hold; a 4-leg parlay of them carries roughly 4 times that edge for the book.
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