Parlay Calculator
Add the legs of your accumulator and see the combined decimal odds, the true payout - and how the book's margin compounds with every leg. Parlays multiply margins, not just odds. Recomputes as you type.
add 2+ legs…
Why parlays are the book's best friend
Each leg carries the margin (a fair 50/50 market pays 2.00; at 1.85 both sides the implied probabilities sum to 108%, a ~7.5% margin). Combining legs multiplies the price AND the margin: two 1.85 legs give 3.42 combined where two fair coin-flips would pay 4.00 - the ticket keeps only ~85.5% of its fair value. Stack five legs and the total margin compounds to roughly a third of the fair price. The calculator names both numbers: what the combined price pays, and how much fair value it keeps.
Same-game parlays
Correlated legs (e.g. team wins map 1 and wins the match) are not independent events - a straight multiplication of the listed prices does not describe your real probability, and books price such combos with an extra cushion. Tag the legs with "same match" and the tool warns you; treat any correlated acca quote with extra suspicion.