>>42432Searched online for stats
The imperium has been growing for 10000 years since it first declared capture of 1 million worlds, and it was known that the orks had existed for millions of years before humanity existed in the 40k setting. I had to check a lot of community posts, worked with AI, and gathered information on casualty rates in various ork-human wars to create population ratio estimates. The estimates I got were based on the ratio of orks to humans, Gretchins to orks, and the lowest estimated number of humans (its huge due to hive worlds and terra being a planet sized city).
When you have to take into account that orks apparently are the second most numerous species (tyranids apparently are only around twice as large as them in terms of numbers due to the fallout of losing the tyrannical wars), and the map of worlds colonized by orks, and the consistency the books have with describing grots (gretchins, small orks) as more numerous than orks, and the fact that orks are apparently omnipresent throughout the galaxy, then the numbers work out to something that sounds plausible given the scale of 40k