Notes:

What I did:

1)I took the official height chart by Trigger and measured each character's height in pixels. Unfortunately the line isn't straight, so some characters might have lost or gained a few pixels. Oh, and I accidentally lost the original image..

2)I created a table that aumomatically converts the pixels in cms. Of course I had to arbitralily choose the height for a character, in order to establish a proportion between pixels and centimeters. I chose Mako because I felt she was the one whose height was easiest to assume: I went for 158 cm, the height of the average Japanese woman.

3)Take them with a grain of salt, but here they are! The guys are REALLY tall. Satsuki is tall. Nonon is tiny, tiny, tiny.

If you want the calc file, I'll gladly share it.