If the OP is asking the questions he is asking how do you think he's gonna know if it's the right size? What he should do is learn how to do the sizing so he knows it's correct. Out of the container nearly all chains will need to be sized. It's easier to put it on the bike and size it the right way than to find the space to put a dirty, used chain and then line up a new one next to it. I can't remember ever doing that. If the OP wants to let me know what kind of bike/drivetrain he has I'd be happy to take 60 seconds to educate him on the correct method.