Jabebee13
Songster
By 1.5 foot wide. How many chicken babies can fit comfortably as they grow
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How many you can have depends on how long they will be in the brooder.
Well said @Ridgerunner.Extremely good point and often overlooked. If you follow those numbers you should be safe. I always try to suggest more space is better than less space.
You should go by what you see. I find that a brood of mostly boys takes more room than a brood of mostly girls. The type of chicks can affect it, Cornish X raised for meat will take more room than bantams.
Where will you brood, inside a climate controlled area or outside where you can get pretty wild temperature swings? To me the ideal brooder has one spot that stays warm enough in the coldest temperatures and also has a spot cool enough in the warmest temperatures. If your brooder is inside a climate controlled area that can be pretty easy to do. My 3' x 6' brooder is built into the coop, I've seen it go from below freezing to over 70* Fahrenheit in 36 hours. Depending on your heat source a larger brooder might help manage those temperature swings.
There will always be exceptions to any rule of thumb, sometimes they are overkill and sometimes they get tight. But those look good to me.
Heat lamp.