Parlay Calculator
Free parlay calculator for sports betting. Enter each leg's American odds — we'll calculate the combined odds, true win probability, and payout.
Leg 1
Leg 2
Leg 3
3/12 legs
Stake ($)
Combined odds
+811
Decimal
9.11
Win probability
10.98%
Payout
$91.12
Profit on a winning ticket: $81.12. Want to know if this parlay is +EV? Run it through the EV calculator or paste it into the Boost Analyzer.
How a parlay calculator works
A parlay combines multiple bets — every leg must win. To compute the combined odds, multiply each leg's decimal odds. For example, three −110 legs (decimal 1.91) → 1.91 × 1.91 × 1.91 ≈ 6.97, or about +597 American. The win probability is just 1 / combined_decimal.