Chicken Coop Size Calculator

Number of chickens Bird size Bantam Standard Large / heavy Management style Mostly confined Mixed Mostly free-range Climate (optional) Not specified Cold Moderate Hot

Calculate

How This Tool Estimates Results #

The calculator multiplies your flock size by per-bird minimums adjusted for bird size and management style:

• Coop per bird: bantam 2 sq ft, standard 4 sq ft, large 5 sq ft.
• Run per bird: bantam 5 sq ft, standard 10 sq ft, large 12 sq ft.
• Management multiplier: confined ×1.3, mixed ×1.0, free-range ×0.85.
• Roost length: 6–10 inches per bird, depending on size.
• Nesting boxes: 1 box per 4 hens, minimum 1.

Example Results #

For 6 standard hens, mostly free-range: ~21 sq ft coop, ~51 sq ft run, ~4 ft of roost, 2 nesting boxes.

For 8 standard hens, mostly confined: ~42 sq ft coop, ~104 sq ft run, ~6 ft of roost, 2 nesting boxes.

Common Mistakes #

• Sizing only for the current flock, not future additions.
• Confusing advertised “holds 8 hens” with actual square footage.
• Forgetting that the run gets used far more than the coop.

FAQ

Why does the calculator ask for management style?

Free-range flocks use the coop mainly for sleeping and laying, so they need less indoor space. Mostly confined flocks need more space to avoid pecking and stress.

What if my numbers fall between two bird sizes?

Round up. A mix of bantams and standards should be sized as if all birds are standard.

Are these numbers minimums or recommendations?

Minimums. More space is almost always better for behavior, health, and cleanliness.