Free tools
Parlay Calculator
Combine two to ten legs into one price and see the payout, profit and implied probability.
Free, no account needed. Informational, not betting advice. 21+.
Legs
2 of 10 legs
Results
- Combined odds
- +264
- Decimal
- 3.64
- Implied probability
- 27.44%
- Payout
- $364.46
- Profit
- +$264.46
Legs from the same game are correlated. Books price those parlays differently, usually with more margin than this independent-leg math shows.
How it works
Convert each leg to decimal odds and multiply them together. That product is the parlay’s decimal price. Payout is the stake times the product, profit is the payout minus the stake, and the implied probability is 1 divided by the product.
Worked example
Two legs at −110 are 1.909 × 1.909 = 3.645, which is +264. A $100 stake returns $364.46 for a profit of $264.46, and the parlay implies a 27.44% chance.
When to use it
Books usually show the combined price on the slip, so use this to check it, or to see what adding a leg does to the payout and the probability. A check reads the whole slip, including the combined price, straight from a screenshot.
Questions
Why is the book’s parlay price different from this one?
Legs from the same game are correlated, and books price those parlays differently, usually with extra margin. Some books also round or cap long parlays. This tool assumes independent legs at the prices you typed.
Does each leg’s vig stack?
Yes. The margin on every leg multiplies into the parlay. Two −110 legs imply 27.44% against a fair 25%, so the margin has grown from 4.76 points on one leg to almost 10% of the fair probability on two.
How many legs can I enter?
Two to ten. That covers nearly every slip a book will take.
Can I mix American and decimal legs?
Choose one format for the page. Switching the format converts the legs you have already typed.
Is this betting advice?
No. The tool is arithmetic on the numbers you type. EdgeFast is informational price discovery, not a sportsbook, and you decide whether to bet. 21+ only.
Related tools
Now check a real price.
Screenshot a betslip and EdgeFast compares your price with the listed sportsbooks and a fair market price.
Informational, not betting advice. 21+.