I think you have to kind of play with the numbers. I have about a 5 x 6 x5 coop, just room for three levels of roosts, and some nest. They do not spend the day in there, I do have a bigger run. But two years ago, I had 10 hens, and they seemed ok, but when a predator got two, I noticed a change in the flock, they seemed more at peace, more comfortable.
In the summer, I had 5 hens and a flock of chicks, as the chicks grew, I could tell there was a bit more pressure in the flock, in the summer I was able to let them free range most of the day, but as the days grow short, and predators more brave, this time of year they are more cooped up in the run, with a few free days. Anyway, things have settled down after I have culled back to 8 in the coop/run.
So if it seems stressed, probably too many. MK
In the summer, I had 5 hens and a flock of chicks, as the chicks grew, I could tell there was a bit more pressure in the flock, in the summer I was able to let them free range most of the day, but as the days grow short, and predators more brave, this time of year they are more cooped up in the run, with a few free days. Anyway, things have settled down after I have culled back to 8 in the coop/run.
So if it seems stressed, probably too many. MK