First, ending a sentence with a preposition is technically incorrect. Most people do it and few people will complain about it.

More importantly, where and at are redundant, plain and simple. Where are you and where are you at mean the same thing in every context, so the 'at' should be dropped.

Repeat 'where you are' over and over, and I promise you, 'where you are at' will start to sound worse and worse.

First, ending a sentence with a preposition is technically incorrect. Most people do it and few people will complain about it.

More importantly, where and at are redundant, plain and simple. Where are you and where are you at mean the same thing in every context, so the 'at' should be dropped.

Repeat 'where you are' over and over, and I promise you, 'where you are at' will start to sound more and more incorrect.