Parlay Calculator
Compute the payout for any parlay. Enter American odds for each leg, add your stake, and the calculator returns the multiplier, total return, profit, and the implied probability of every leg hitting.
Parlay Calculator
Implied probability assumes the operator's odds are accurate. Real-world win probability may be higher or lower; sportsbooks build in 4–10% house edge per leg, which compounds across parlays.
How to Use
- Enter your stake (the amount you want to bet)
- For each leg, enter the American odds; positive numbers like 150 for underdogs, negative like –180 for favorites
- Click "+ Add Leg" for more legs (up to 10)
- The results update live
How the Math Works
Each leg's American odds convert to a decimal multiplier. Negative odds (e.g. –150): 1 + 100/150 = 1.667. Positive odds (e.g. +250): 1 + 250/100 = 3.50. Multiply all leg multipliers together to get the parlay multiplier. Multiply by stake to get total return. Subtract stake to get profit. Implied probability per leg: for negative odds odds/(odds+100); for positive odds 100/(odds+100). Combined probability is the product of leg probabilities.