The Big Bang Theory The Tallest Shortest Actors In The CastJohn Galecki stature is roughly 165 centimeters. He stands at a average height. Although some may consider him not to be remarkably tallness, his talent is limitless. Regardless of his upright dimension, he is valued in showbiz for his acting skills. Johnny has showcased time and again that being tall doesn't define one's accomplishments when it comes to reaching excellence.