16 Layers and 1 Rooster in 64 sq.ft. of coop space, approx. 190 sq.ft. of run,64 of it under the coop and another 600sq. of a fenced in pen area. Averages out to 50sq.ft. per bird. Then the occasional total free range day when I am with them then it's over a half of acre in my front yard and more in my neighbors old horse paddock. Got to keep an eye on them as there are far too many opportunists milling about. Both air and land.