A chicken coop should be sized for the number of hens you actually plan to keep, not the number printed on a tiny prefab box. Crowded chickens are more likely to peck, fight, smell bad, stop laying, and become harder to keep healthy.
Quick Answer
Most backyard chickens need at least 4 square feet of indoor coop space per standard hen and at least 8 to 10 square feet of outdoor run space per hen. Bantams can use less space, while large breeds and confined flocks need more.
Chicken Coop Size Chart
The Simple Formula
Use this formula for standard backyard hens:
- Indoor coop: hens x 4 square feet
- Outdoor run: hens x 10 square feet
- Roost space: hens x 10 to 12 inches
- Nest boxes: 1 box for every 3 to 4 hens
If your chickens will spend most of the day inside the run, use the larger number. Extra space is almost always easier than fixing an overcrowded flock later.
Coop Size By Flock
Coop Size For 4 Chickens
Four standard hens need at least 16 square feet inside the coop and about 40 square feet in the run. A 4 by 4 foot coop can work if the run is generous and the birds get outside daily.
Coop Size For 6 Chickens
Six hens need at least 24 square feet of coop space and 60 square feet of run space. A 4 by 6 foot coop is a practical minimum, but a 6 by 6 foot coop gives more breathing room.
Coop Size For 8 Chickens
Eight hens need at least 32 square feet inside and 80 square feet outside. A 4 by 8 foot coop is a clean minimum. If you live in a wet or cold climate, go larger because birds may spend more time indoors.
Signs Your Coop Is Too Small
- Feather picking
- Fighting at the roost
- Strong ammonia smell
- Dirty eggs
- Chickens sleeping in nest boxes
- Bare patches around the run
- Birds crowding the door each morning
The Bottom Line
For standard backyard chickens, plan at least 4 square feet of coop space and 10 square feet of run space per hen. If you are unsure, build bigger. Space is one of the easiest ways to prevent stress, odor, pecking, and beginner frustration.
