To calculate parlay odds, convert each leg's American odds to decimal, multiply the decimals together, then convert back. Four legs at -110, -110, -135 and +150 combine to about +1486, so a $5 stake returns about $79.30.
4 legs. Profit if every leg wins: $74.30.
Prefilled with the SAMPLE ticket. Use American odds like -110 or +150.
The parlay formula
- Convert each leg to decimal. Plus odds: odds / 100 + 1. Minus odds: 100 / odds (without the minus) + 1.
- Multiply every decimal together.
- Payout = stake x combined decimal.
- Back to American: if the decimal is 2.00 or more, (decimal - 1) x 100, with a plus sign.
Worked example
SAMPLE 4-leg parlay: 1.909 x 1.909 x 1.741 x 2.50 = 15.86. Combined odds: +1486. $5 stake returns $79.30. Implied chance of the combined price: 6.3%.
This is the same sample ticket built on the home page. Every leg and price is made up for illustration.
What a calculator cannot tell you
- The true odds. The calculator shows what the price implies, not what will happen.
- The stacked margin. Each leg carries the book's juice, and a parlay multiplies it.
- Correlation. Legs from the same game can move together. Books price same game parlays with that in mind.
Use the numbers to size the bet, not to justify it. Parlays stay small. See unit sizing.
Key takeaways
- Convert to decimal, multiply, convert back.
- The implied chance falls fast with every leg.
- Payout is stake times the combined decimal.
Frequently asked questions
How do you calculate parlay odds?
Convert each leg to decimal odds, multiply them together, and multiply by your stake for the total return.
How do I convert American odds to decimal?
Plus odds: divide by 100 and add 1. Minus odds: divide 100 by the odds without the minus sign and add 1.
What does implied probability mean on a parlay?
It is 1 divided by the combined decimal odds. It is the chance the price implies, before accounting for the book's margin.
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Picks from Nicky Brows, posted in the Discord with the why behind every play.
Join the Discord21+. Picks are opinions, not guarantees. All examples on this page are samples.
