Does a Brahma count as 2 chickens?

[UrbanFarmerKim]

I am working on my coop and chicken run area this weekend and needed some advice. I have a barred rock, a buff orpington and a light brahma (all 3 weeks and still in the house). With the size of the brahma as an adult, should I count her as 2 chickens when configuring space needed inside the hen house?

 

[TimCline]

The space needed doesn't have to be exact. Just ballpark. And depending on where you got them the brahma shouldn't get much bigger than the buffs or rocks. A few pounds bigger at most