Our parlay calculator shows you not only the payout for any kind of parlay but also the implied probability. This % is so important because you see sports books and handicappers advertising parlays with crazy odds and calling them "locks", but when you look at the odds as probabilities you can see why so few hit and why the sports books love advertising them.
It is important to understand that betting on only parlays is almost always a -EV (Expected Value) strategy. In our community we rarely bet parlays with more than 2 legs. If we do they are often just sprinkles with pocket change for fun or we use a free bet to maximize our EV.