I am going to have 57 chickens when my order gets here in 24 days (I'm not counting). Out of those 57, ten are roos (maybe 11, if I get a roo as my free rare chick). 8 to 9 of those roos are gonna be in a separate area, since they are for breeding purposes. Two of them have been with my original flock since 1 month old, and unless they start fighting are gonna stay (that's 2 roos for 26 hens) So, that's 47-49 chickens together (3 bantams). Based on this, I have almost 3 sq ft per chicken in my coop, with what will be 80 sq ft of roost space. I also have almost 7 sq ft of run space per chicken. I'm gonna be watching them when my flock is complete to see if they're comfortable with that amount of space, and if not I'm either gonna be cooking a lot of chicken or if money presents itself (LOL) I'll be expanding. From what I've seen they are VERY good at making sure you know what they want (food, water, outside, treats, picked up, just plain attention) so I would observe them as they grow and expand accordingly. Make sure you have about 2.5 or more sq ft coop space to start with, and as much run space as possible since extending a run is a pain after you have the fencing in and predator proofed. Maybe like 6ft per bird to start, if ur comfortable with that.