Godzilla varies in height depending on the movie/show.
In the original Godzilla movies (1954-1975), Godzilla stood around 50 meters tall. He would become progressively taller in later movies. In the movie Godzilla 1984, he stands around 80 meters. He then stands around 100 meters in various movies in the early-mid 90’s and 2004.
In Godzilla (2014) and in the upcoming Godzilla: King of the Monsters (2019), Godzilla stands at 108 meters (355 feet). However, his largest incarnation yet, Godzilla: Planet of the Monsters, Godzilla Earth stands at well over 300 meters and over 100,000 tons.