Go with the general consensus of the proper tie length: It should hit at or just above your trouser waistband—and the pointed edge should hang no further than the middle of your belt buckle.

Where should the tip of the tie end?

Essentially, the tip of your tie should end in the middle of your waistband (or belt if you are wearing one) when you are standing in your natural posture.

How do you know if a tie is too long?

Your tie becomes too short when you can see some shirt fabric between its end and your waistband; historically, this look was appropriate, but during the 20th century, a longer length became the norm. On the other hand, when you can see the end peeking out from underneath your vest or waistband, it's clearly too long.