Question 1

How are parlay odds calculated?

Accepted Answer

Convert each leg to decimal odds and multiply them all together. The product is the parlay's combined decimal odds. For example three legs at 1.91 each give 1.91 x 1.91 x 1.91 = about 6.97, or roughly +597 in American odds.

Question 2

Is a parlay ever +EV?

Accepted Answer

Only if every single leg is itself a positive-EV bet. A parlay multiplies the legs' true probabilities, but it also multiplies the sportsbook's vig — the hold compounds with each leg. So a parlay built from break-even or negative legs is sharply negative EV, which is why most parlays lose money over time.

Question 3

How do I check if my parlay is +EV?

Accepted Answer

Enter each leg's fair win probability (your honest estimate, ideally from a de-vigged sharp price). The calculator multiplies them for the parlay's true win probability, compares it to the book's combined payout, and reports the expected value per dollar staked. Positive means +EV; negative means the book has the edge.

Question 4

Why do parlays lose more than singles?

Accepted Answer

Because the vig compounds. Each leg carries the sportsbook's commission, and stacking legs stacks that commission multiplicatively. Even legs priced fairly leave a bigger combined hold than a single bet, and any negative-EV legs make it much worse. We tested parlay finders on real games and cut the feature for this reason.

Parlay Calculator + EV Check

How it works

FAQ