How parlay odds are calculated
A parlay combines multiple selections into one wager. Every leg must win for the parlay to win. Convert each leg to decimal odds, then multiply those prices together.
Combined decimal odds = leg 1 × leg 2 × leg 3 × …
Example: 1.91 × 1.91 = 3.6481, displayed as 3.65
Example: 1.91 × 1.91 = 3.6481, displayed as 3.65
A $25 stake at 3.6481 has a potential profit of $66.20 and a total potential return of $91.20 before any operator-specific rounding.
Why each leg changes the probability
The combined implied probability is 1 divided by the combined decimal price. Two legs at 1.91 produce a combined implied probability of approximately 27.41%. Adding a third 1.91 leg lowers it to approximately 14.35%.
This simple multiplication assumes the events are independent. Related outcomes can behave differently, which is why sportsbooks may restrict correlated parlays or apply a separately calculated price.
Why the sportsbook total may differ
- Individual legs may contain more precision than the displayed two decimal places.
- The sportsbook may round only after combining every leg.
- Promotional boosts, same-game rules, void legs, and correlated outcomes can change the accepted price.
- The accepted bet slip controls settlement.
A larger potential return corresponds to a lower implied probability that every selection wins. Combined odds do not indicate value.