Parlay Calculator

How it works

decimal odds of each leg: American +A → 1 + A/100, American −A → 1 + 100/A, fractional a/b → 1 + a/b · parlay odds = d₁ × d₂ × … × dₙ · payout = stake × parlay odds · profit = payout − stake · implied probability = 1 ÷ parlay odds

A parlay (accumulator or multi) rolls the whole return of each leg onto the next, so the decimal odds multiply. Every leg must win; a single loss loses the whole bet. Most sportsbooks drop a pushed or void leg and recalculate at the remaining legs' odds, so to check that case just clear the leg. Because each leg's price already contains the bookmaker's margin, the margins compound too — the implied probability shown is the book's, not the true chance.

Worked example

A $20 three-leg parlay at 2.10, 1.85 and +150 (2.50 decimal) has parlay odds of 2.10 × 1.85 × 2.50 = 9.71 (decimal), about +871 American. It pays $194.25 in total, a profit of $174.25, and the odds imply about a 10.30% chance that all three legs win.

Sources: NCPG — Responsible gambling · Wikipedia — Parlay (gambling)

Frequently asked questions