The key difference between a parlay bet and an accumulator bet is the terminology, with 'parlay' being more commonly used in North America, while 'accumulator' is preferred in the UK and other parts of the world. Parlay bets, also known as accumulator bets in some regions, are wagers that combine multiple selections into a single bet. How Does A Parlay Bet Calculator Work?Ī parlay bet calculator is a tool that helps bettors calculate potential returns for parlay bets.