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A parlay (or accumulator) combines multiple individual bets into one. All legs must win for the parlay to pay out. The odds multiply together, creating potentially massive payouts from small stakes.
Formula: Combined Odds = Odds1 × Odds2 × Odds3 × ...
Warning: Each additional leg dramatically reduces the probability of winning. A 5-leg parlay where each leg has 50% probability only has a 3.1% chance of winning. Use our EV Calculator to check if a parlay has positive expected value.
Formula: Combined Odds = Odds1 × Odds2 × Odds3 × ...
Warning: Each additional leg dramatically reduces the probability of winning. A 5-leg parlay where each leg has 50% probability only has a 3.1% chance of winning. Use our EV Calculator to check if a parlay has positive expected value.
Mathematically, parlays are almost always -EV because each leg carries the bookmaker's vig, and these compound. A 3-leg parlay at a book with 5% vig on each leg results in approximately 14% total vig — much worse than betting each leg individually.
However, parlays can be +EV if you are combining genuine +EV legs (correlated outcomes) or using reduced juice bookmakers. Use our Kelly Criterion Calculator to size any +EV parlay correctly.
However, parlays can be +EV if you are combining genuine +EV legs (correlated outcomes) or using reduced juice bookmakers. Use our Kelly Criterion Calculator to size any +EV parlay correctly.
Professional bettors rarely use more than 3 legs in a parlay. 2-3 legs keep the probability manageable while still offering enhanced odds. Beyond 4 legs, the true win probability drops so low that even large payouts rarely compensate for the risk over a sample. Use our Arbitrage Calculator instead to find guaranteed profit opportunities.