Build parlays using positive EV legs. See combined odds, win probability, and payouts for any parlay combination.
Enter American odds for each leg. The optional “true %” column accepts an estimated probability that the leg actually hits — when every row is filled, the widget returns expected value in dollars. Math: combined decimal is the product of leg decimals; combined implied probability is 1 ÷ combined decimal.
A parlay combines two or more individual bets into a single wager. Every leg of the parlay must win for the bet to pay out. In exchange for this added difficulty, the odds multiply together, producing much larger payouts than placing each bet individually.
A 3-leg parlay with each leg at -110 pays roughly +596 (about 6:1), compared to winning three separate bets at -110 which would yield much less total profit for the same risk.
Sportsbooks love parlays because the house edge compounds with each leg. A standard 2-leg parlay at -110/-110 has a theoretical house edge of about 10%, compared to 4.5% on a single bet. Add more legs and it gets worse.
This is why most betting advice says to avoid parlays. But that advice assumes the legs are priced at standard juice. When each leg is a +EV bet, the math changes entirely.
MyOddsy’s parlay builder takes a different approach. Instead of stacking favorites blindly, it builds parlays from legs that individually have positive expected value:
Parlay odds are calculated by converting each leg to decimal odds and multiplying:
Step 1: Convert American odds to decimal
Step 2: Multiply decimal odds together
Example: 2.50 x 1.667 x 1.909 = 7.95 combined decimal odds
Step 3: Calculate payout -- $100 x 7.95 = $795 total return ($695 profit)
A parlay combines multiple individual bets into one wager. All legs must win for the parlay to pay out. The odds multiply together, creating larger potential payouts but lower win probability.
Convert each leg to decimal odds and multiply them together. Three legs at -110 each: 1.909 x 1.909 x 1.909 = 6.96 decimal odds, or roughly +596 in American odds.
Standard parlays have a higher house edge than straight bets. However, building parlays with +EV legs can create positive expected value. The key is selecting legs where each individual bet has a mathematical edge.