Parlay calculator
Enter your odds in American or decimal, set a stake, and see the combined decimal, the implied probability and the payout. Add or remove legs up to ten — the math updates as you type.
How parlay math works
A parlay multiplies the decimal odds of every leg together. For two legs at −110 (1.91 decimal), the combined decimal is 1.91 × 1.91 = 3.65, so a $100 parlay returns $365 on a hit. Implied probability is 1 ÷ combined decimal: at 3.65 that’s 27.4%, which is also the book’s break-even win rate (before edge).
American odds convert: positive odds ÷ 100 + 1 for plus prices, 100 ÷ |odds| + 1 for minus. The calculator handles both formats and switches them in place when you toggle the segment control.
Want a parlay the model already priced?
NotaSportsGuru publishes one curated +EV Parlay of the Day, every morning, with the legs, the combined odds, and the model’s expected value. Free to browse, members get the edge on every leg.