Happy to help! Will finish later Eldar(some guys left) and will do vehicles or tyranids.

I guess your google-fu is stronger then mine, or you are more persistent

what about vehicles size?

I don't have a great insight into what vehicles are included in the game so far. I can do some searching later for vehicle info as well, figured I would just start with the smallest and build my way up

You`d better don`t know how I done this

Tyranids:
Hive tyrant- 6,1m (19,8ft)
Carnifex- 4,5m (14,9ft)
Hierophant- 15m (49,3ft)
Ripper- 0,3m (0,12ft)
Malanthrope- 6,1m (20ft)
Broodlord- 2,8m (9,2ft)
Genestealer/Ymgarl genestealer- 1,9m (6,3ft)
Gaunts- 1,3m (4,3m)
Gargoyle- 1,1m (3,7ft)
Lictor- 2,4m (7,1ft)
Ravener- 5m (16,5ft)
Zoanthrope- 3,5m (11,6ft)
Tyranid warrior/Tyranid prime- 2,4m (7,1ft)
Harpy/Shrike- 2,4m (7,1ft)
Biovore/Pyrovore- 2m (6,7ft)
Hierodule- 4,9m-5,8m (16,1-26,3ft)
Trygon/Trygon prime/(Mawloc?)- 7,1m (23,4ft)

Finnaly finished (but still some cool tyranids left). Thanks lexicanum. Will also edit tau and eldars later.
Does somebody know hive guard and tyrant guard size?

We've got Trygon's in our game don't we? 7.1m pmsl

It would be cool if he will be, I just wrote every tyranid who size I knew

Woo more sizes! That's great. I haven't had time today as I have had visitors, but hoping to get started with some nice visual comparisons tomorrow

All vehicle sizes are listed in the warhamer 40k wiki

The land raider phobos pattern for example is the nearly 1.5 times the length of modern day abrams tank however it is 2-3 times high.