Combine the legs, see the payout.
Add each leg's American odds and a stake. The calculator multiplies them into one combined price and returns the total payout, your profit, and the parlay's implied probability. It handles up to twelve legs, and you can mix NFL, NBA and MLB prices on the same slip.
Total payout
Combined odds
Implied probability
Legs that multiply, not add
A parlay ties several selections into one wager: every leg has to win for the ticket to cash. To price it, each leg's American odds are converted to decimal odds, and those decimals are multiplied together into a single combined number.
Your stake times that combined decimal is the total payout, and subtracting the stake leaves the profit. Because the legs multiply, the potential return climbs fast, but so does the difficulty. The implied probability figure keeps that in plain sight, since it is one divided by the combined odds, the break-even chance that every leg lands.
A concrete walk-through
Say you build a three-leg parlay from an NFL spread, an NFL total, and an NBA spread, each priced -110, with a $100 stake. Each -110 leg is decimal 1.909, so you multiply the three together: 1.909 × 1.909 × 1.909. The combined decimal comes to about 6.96, which is roughly +596 in American terms.
A $100 stake at decimal 6.96 returns about $696 total, which is a $596 profit. The implied probability is 1 ÷ 6.96, or about 14.4%, and that figure is the break-even chance that all three legs win together. Add a fourth -110 leg and the payout jumps past $1,300 while the implied probability drops under 8%, which is the parlay trade-off in a nutshell.
Parlays, answered
How does a parlay calculator work?
It converts every leg's American odds to decimal form, multiplies those decimals together to get the combined odds, then multiplies your stake by that combined figure to get the total payout. Profit is the payout minus your stake. This calculator does all of it as you type, for up to twelve legs.
How is parlay payout calculated?
The decimal odds of each leg are multiplied together into one combined decimal number, and your stake is multiplied by that. For example, two legs at decimal 1.91 combine to about 3.65, so a $100 stake returns roughly $365, which is a $265 profit. Adding more legs multiplies the potential return but lowers the chance all of them hit.
Why do parlay odds get so large so fast?
Parlay odds grow quickly because the legs multiply rather than add. Each additional leg scales the combined decimal odds by that leg's price, so the payout climbs fast, but the combined probability that every leg wins shrinks just as fast. The implied-probability figure in the result makes that trade-off visible.
What is the implied probability of a parlay?
It is one divided by the combined decimal odds, shown here as a percentage. It represents the break-even likelihood that all legs win together at the price you have entered. A longer parlay carries a smaller implied probability, reflecting how much has to go right.
Does this account for correlated legs?
No. Like a standard parlay calculator, it treats each leg as independent and simply multiplies the prices. Real-world legs can be correlated, and some sportsbooks price same-game parlays differently, so treat the output as the straightforward multiplication of the odds you enter, not a book-specific quote.
Can I mix sports and mix positive and negative odds?
Yes on both counts. Enter each leg exactly as the book shows it, with a favorite as a negative number and an underdog as a positive one. The calculator converts each price to decimal before combining, so an NFL leg, an NBA leg, and an MLB leg can sit on the same slip without any extra work.
Build slips from projections
The calculator prices any parlay you build by hand. The DFS Pick'em Optimizer starts from daily model projections and assembles multi-leg slips against the app line for you.