The Correct Answer is:
I realize a many individuals trust he’s around 8’5″, however he said he was dead. (“… and now that I’m dead, I might eliminate my cap and present Shakespearean statements”) So, he must be alive eventually, and it’s farfetched that he developed to godlike level while living. Despite the fact that he seems, by all accounts, to be very tall, I would gauge him to be around 6’5″, yet that is basically the way in which tall he showed up in the film. Notwithstanding, not long after the film’s delivery, an item named a “daily existence size cardboard pattern” of Jack Skellington with a level of 5’10” was delivered, in this manner it’s truly conceivable that is his level.