Parlay Calculator
Multiply odds across any number of legs. Get combined odds, implied probability, payout, and profit instantly. Supports American, decimal, and fractional formats.
Parlays Explained: The Math, the Trap, and When They're Worth It
Why parlays favor the book, the probability collapse most bettors miss, and the cases where parlays are actually defensible.
Read itWe think in parlays. Multi-leg bets where every leg has to hit. The same logic powers our app: every day is a parlay of habits, and the streak only counts if every leg cashes.
See the appParlay calculator FAQ
How is a parlay payout calculated?
Convert each leg's odds to decimal odds, multiply them all together, then multiply by your bet. Example: three legs at -110 are each 1.91 in decimal. Combined: 1.91 × 1.91 × 1.91 ≈ 6.97. A $10 bet pays $69.65. The calculator above does this for any number of legs in any odds format.
What does -110 mean?
-110 means you risk $110 to win $100 (or any equivalent ratio: $11 to win $10). It's the standard 'vig' American sportsbooks charge on a coin-flip line. Implied probability: 52.4% — the book's edge is the gap between that and a true 50/50.
What does +150 mean?
+150 means a $100 bet wins $150 in profit (total payout $250). Positive American odds show the profit on a $100 stake. Implied probability: 40.0%.
What is implied probability?
The probability the odds suggest will happen, ignoring the book's vig. Decimal odds of 2.00 imply 50%, 1.50 imply 66.7%, 4.00 imply 25%. Formula: 1 / decimal odds.
Why do parlay payouts grow so fast?
Because probabilities multiply. A 50% × 50% × 50% parlay is 12.5%. The bigger the payout, the lower the probability of cashing. Long parlays look enticing because the payout balloons faster than your brain wants to discount the probability collapse.
Are correlated parlays calculated the same?
No. Correlated parlays — where one leg makes another more likely — are usually blocked or repriced by sportsbooks because the simple multiplication overstates payout. This calculator assumes independent legs.
Does this work for prop parlays and same-game parlays?
Yes for math purposes — feed in whatever odds the sportsbook shows you and it multiplies them. But sportsbooks often price SGPs differently than naive multiplication because of correlation. Always trust the book's quoted SGP price over this calculator for SGP-specific bets.