What size should chicken nest boxes be?

Too small and the birds won't fit, too big and too many birds will fit.
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NOTES:
The most effective nest boxes that I have found at 1' x 1' x 1'. That leaves enough room for the hen to be comfortable but discourages multiple hens from crowing in on top of each other. Which they will do.
Make sure you have enough nest boxes for all of your chickens. The general rule is 1 best box per every 4 hens. If you only have 4 hens give them at least 2 boxes.