Parlay Calculator

A parlay ties several bets into one ticket. Every leg has to win for the ticket to pay, and in exchange the payout is far larger than any single leg. This calculator shows exactly how large, and what the price implies.

How the payout is calculated

Each leg's American odds are converted to decimal odds, and the decimals are multiplied together. Your payout is your stake times that combined decimal, and the implied probability is one divided by it.

Two legs at -110 each are 1.909 in decimal. Multiplied, that is 3.645, or +264 in American odds: a $100 ticket returns $364.46, and the price implies a 27.4% chance that both legs win.

Where the odds come from

You can build legs from current NFL, NHL and MLB games or type in any odds yourself, up to six legs. Spread legs use the best price we track across sportsbooks for that side, and moneyline legs use the listed moneyline. Totals are priced at a standard -110, and spread legs fall back to -110 when no price has been posted yet. Your sportsbook's price may differ, so check it before you bet.

What this calculator can't tell you

It does not predict whether any leg will win. The implied probability is the sportsbook's price, not an estimate of your chances.

The book's margin compounds with every leg. Two true coin flips hit together 25% of the time, which is fair at +300; at -110 each the ticket pays +264, and the gap is the margin on both legs. More legs widen it.

The math assumes the legs are independent, which is why each game can supply only one leg. Outcomes from the same game tend to move together, and sportsbooks price same-game parlays differently.

If you or someone you know has a gambling problem, call the National Council on Problem Gambling helpline: 1-800-522-4700.