Parlay calculatorHERMES TOOLS · Odds math
Decimal odds and stake for 2–12 legs, with system bets and per-leg win / loss / void.
Result
How it works: formula and examples
Parlay odds are the decimal odds of each leg multiplied together. Total return = stake × total odds; profit = total return − stake. A single parlay needs every leg to win; if one leg loses, the return is 0.
Example: 1.80 × 1.90 = 3.42. With a 100-unit stake, winning both returns 342 units for 242 units profit. If one leg is voided it counts as odds of 1: 1.80 wins and 1.90 is void, returning 180 units.
System bets use a stake per combination. With 3 legs all at 2.00 and sizes 2 + 3 ticked, you get three doubles and one treble, 4 combinations. At 100 units each the total stake is 400 units; if everything wins the return is 2000 units and profit 1600 units.
Unsettled legs show the potential return; a combination counts as settled only when all its legs are settled. Implied win probability = 1 ÷ the product, a pure odds conversion. Correlated selections from the same match can't always be multiplied.
FAQ
Does the return include the stake?
Yes. Profit subtracts the stake separately; a losing bet's profit is minus the stake.
How many legs can I enter?
Both single parlays and system bets support 2–12 legs, which you can add or remove.
How are voids handled?
A void leg's odds become 1. If every leg in a combination is void, the return equals that combination's stake.
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All tools ›This tool is for math and data reference only and offers no betting services. Do not buy sports lottery tickets if you are under 18.