Is my barn big enough??

[chickenwoods]

Total i have 31 chickens(now),
13 of them i have in the barn,and 18 in the tractor,
the ones in tracter will not be at laying age till lat nov.
When its all said and done i want to put them all in my barn.

They be free ranging on 5 acres that i will alow them to roam (LOL)
But i wont be free ranging them all day,just after i get home
from work -till dark they will free range.
My barn is 15'x20'.Is there enough room for them in there for 31 birds till i get home.

 

[CoyoteMagic]

15x20=30sq ft/4ft per bird=75

Oh yeah, you can get a few more too!