How parlay odds are calculated
A parlay pays only if every leg wins, and the decimal odds of the legs multiply. The payout is the stake times the combined decimal odds, and the profit is the payout minus the stake.
The implied probability of the parlay is 1 divided by the combined decimal odds. Because each leg carries the sportsbook’s margin, that margin compounds with every leg you add: a parlay of fairly priced legs is still worse value than it looks.
- Combined decimal odds = leg 1 × leg 2 × … × leg n.
- Payout = stake × combined decimal odds (stake included); profit = payout − stake.
- Same-game parlays and correlated legs are priced by the book, not by simple multiplication, so a book’s own quote may differ.
Questions
How do you calculate parlay odds?
Convert each leg to decimal odds and multiply them. Multiply the result by your stake for the total payout. The calculator does this for any mix of odds formats.
How many legs can a parlay have?
This calculator handles 2 to 10 legs. Sportsbooks set their own limits and some cap payouts.
Why do parlays have a higher margin than single bets?
Every leg includes the book’s vig, and in a parlay those margins multiply together. Two -110 legs imply a combined 52.38% × 52.38% = 27.44% chance, while the fair chance of two true 50% legs is 25%.
Does it work for same-game parlays?
It multiplies the prices you enter, which is how independent legs are combined. Books price same-game parlays with correlation, so their quote can differ from this result.
Put it into practice: Sportsbook odds comparison · Player prop research. Livdy shows every book’s price side by side and the game logs behind every prop hit rate.