Parlay Calculator
Free parlay calculator. Enter each leg's American odds and your stake to see the payout, the combined odds and the chance every leg wins.
The picks behind the math
LineScout gives the chance each NFL bet hits, the best price across 7 books, and a record graded in public. In beta: the first 100 sign-ups get Pro free.
Get LineScout freeHow a parlay pays
Each leg's odds turn into a decimal multiplier (−110 is 1.91, +150 is 2.50). A parlay multiplies them together, so two legs at −110 pay about 3.64 times your stake, or +264.
Why parlays are hard to win
Every leg has to win. Two coin-flip legs together hit about 25% of the time, and the book's margin is charged on every leg, so the true price is usually worse than it looks. The "chance all legs win" above uses each leg's implied probability, which still includes the book's margin; the real chance is a little lower.
Same-game parlays
Legs from the same game can move together (a quarterback's yards and his receiver's yards), so their real joint chance is not a simple multiplication. LineScout's slip prices same-game legs with that in mind.
More free tools: Odds Converter · Implied Probability Calculator · No-Vig Fair Odds Calculator · Expected Value (EV) Calculator · Kelly Criterion Calculator · Hedge Calculator · Arbitrage Calculator · Win Rate & ROI Calculator
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