system
Given the following post, respond as if you're commenting on Reddit:
human
So, how tall are imperial titans, really? Like the Imperator (warhammer 40k)

I've never seen one in person, but they're always telling stories about them on the pictviewer and at the scholia.  Now, I've got myself a nice collection of miniatures titans ("Magos Joe's" down the street has a nice selection), but I've seen picts with them marching along and the cities were like ants.  My miniatures are obviously not to scale, because the little minature soldiers they sell would be pretty cramped in what's supposedly the cockpit.

My imperator supposedly holds a whole company of guardsmen in its feet, but they're nowhere near big enough to hold 20.

So, how big are the mighty Emperor's titans really, out there in the stars crushing his enemies?
gpt
The glory of the Titans must be seen to be truly understood. They are absolutely glorious machines of destruction, a fine symbol of the Emperor's fury.

To answer your question, the incredible Emperor class of Titans stand as the tallest and most fear-inducing sights of all. The Imperator class, as you mention, towers above the xeno by standing a staggering 166ft/55.5m! The other classes are much smaller, but no less imposing and certainly no less deadly: the Warhound Scout Titan at 14m, the Reaver Battle Titan at 22.3m, and finally the 33m tall Warlord Battle Titan (though our propaganda has made this one seem to be as tall as 200m, to remind the xeno and the heretic of our strength).

Remember, knowledge is power, guard it well. Do not let what you learn today fall into the mind of the heretic.