Convert each leg’s odds to decimal odds
Multiply all decimal odds together
The result is the parlay’s total decimal odds
To find total payout, multiply the stake by the total decimal odds
To find total profit, subtract the original stake from the total payout
For American odds:
If odds are positive, decimal odds = 1 + (odds ÷ 100)
If odds are negative, decimal odds = 1 + (100 ÷ absolute odds)
For multiple legs, multiply all converted decimal odds
For parlay American odds, convert the final decimal odds back to American odds if needed
If total decimal odds are 2.50 or higher, American odds = (decimal odds – 1) × 100
If total decimal odds are below 2.50, American odds = -100 ÷ (decimal odds – 1)