Just in case anybody else was as curious as to the change of heights in Megatron between continuity streams as I was, I decided to make a rather crude visualisation. I have to say, I was rather shocked by a couple of them. I’m intrigued as to what the change has been like for other characters now.
I would also like to stress how difficult it was to obtain a decent, full body image of Armada Megatron - I had to resort to screenshotting my DVD and cropping it. So I apologise for the poor quality of the picture.
All of the above measurements are canon sourced from TFWiki, as well as somebody else’s previous calculations to discern the heights of tfp characters which I have also provided below. Since there doesn’t seem to be any other data regarding Transformers Prime beside a vague reference from Fowler suggesting Optimus is roughly 30ft (9.1m). Which their calculations agree with.