Parlay calculator

Enter each leg's odds and a stake. The calculator returns the parlay's combined odds, the total payout, the profit, and the chance the sportsbook's price implies. Nothing to sign up for, and nothing is stored.

Most parlay calculators stop at the payout. The payout is the easy half — it is arithmetic, and every calculator agrees on it. The half that decides whether the ticket is worth buying is the true chance all those legs land, which is not the chance the price implies. That is what a parlay checker adds, and it is what the bet checker on this site does.

How are parlay odds combined?

A parlay pays only if every leg wins, so the legs' chances multiply. The steps:

  1. Convert each leg's American odds to a decimal price.
  2. Multiply the decimal prices together. That product is the parlay's decimal odds.
  3. Multiply the stake by the parlay's decimal odds to get the total return. Subtract the stake for the profit.

A worked example. Three legs at -110, -110 and +150:

What does the implied chance mean?

Flip the parlay's decimal odds and you get the chance the price implies: 1 divided by 9.1116 is 11.0%. That is the number the sportsbook is quoting, and it already includes the sportsbook's cut — the rake. Add up the implied chances on both sides of any single market and the total comes to more than 100%; that overage is what the book keeps, and it compounds on every leg you add.

This is why parlays get expensive quietly. Each leg is priced with a margin, and stacking legs stacks the margins.

How do you convert American odds?

The calculator above takes American or decimal odds and converts as you type.

What happens if a leg pushes?

A push is a leg that ties — a total landing exactly on the number, or a spread landing exactly on it. Most sportsbooks void the pushed leg and re-price the parlay with the legs that remain, so a three-leg parlay with one push pays as a two-leg parlay. It does not void the whole ticket, and it does not pay as though the pushed leg won.

Set a leg to "push" in the calculator to see what the ticket pays after the leg drops out.

Why don't correlated legs simply multiply?

Multiplying the legs assumes they are independent, which is true for legs in different games and false for legs in the same one. A pitcher going over on strikeouts and his team's game going under on total runs are pulled by the same events. The payout above still multiplies, because that is how the sportsbook prices it — but the real chance of the ticket landing is not the product of the parts.

Same-game legs are the case where a payout calculator is furthest from the truth. Grading them means simulating the game itself and counting how often the whole ticket would have landed together, which is what a parlay EV check does.

Is the parlay any good?

The payout tells you what the ticket pays. It does not tell you whether the price is fair. For that, the parlay's true chance has to come from somewhere other than the price on the slip.

That is the job a parlay checker does, and it is a different job from the arithmetic above. The checker grades each leg against thousands of simulated runs of the games those legs live in, combines them into one true probability for the whole ticket, and sets that against the quoted payout. When the true chance is higher than the implied chance the price is generous. When it is lower, which is the usual answer on a long parlay, the ticket is priced above what it is worth.

Check a parlay against the simulated slate. Ten free checks a day, unlimited signed in.

Parlay payout by leg count

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