A cramped coop is where feather picking, egg eating and disease all start. This chicken coop size calculator uses the standard backyard flock guidance: 4 square feet per bird inside the coop, 10 square feet per bird in the outdoor run.
Chicken Coop Size Calculator
More space is always better, especially for larger breeds or a flock that spends most of its day cooped up in bad weather. The backyard chicken supplies guide covers coops, doors and waterers sized to match.
Gunner Vance