Brooder Size?

[Bessetti]

I am getting 16 chicks in the spring, and was curious what brooder size people would recommend. It is likely there will be more like 20 chicks because I might "accidentally" pick some up at The tractor supply store

So what size brooder would you recommend for 20 chicks? I will be hatching more in the future, once they are grown. ALSO I want to brooder to hold them until they go outside to the coop.

I have enough free plywood pallets that I deconstructed to make it from that I can do absolutely any size.

 

[HighStreetCoop]

I have 13 in a 4'x 3' pumpkin box. At 6 weeks, it's stsrting to feel small...