Chicken Coop Size Calculator
Recommended coop and run size for your flock.
Enter your values
Enter the number of chickens you are working with.
Choose one of: Standard breed, Bantam (smaller breed).
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Coop floor space needed
- 21 sq ft
- Run space needed
- 54 sq ft
- Nesting boxes needed
- 2
- Roost bar length (8-10 in/bird)
- 54 in
Quick answer
Standard guidance is 3-4 sq ft of coop space and 8-10 sq ft of run space per standard-size chicken.
coop area = chickens x 3.5 sq ft; run area = chickens x 9 sq ft; nesting boxes = chickens / 4
At a glance
| What it does | Recommended coop and run size for your flock. |
|---|---|
| Category | Home & DIY |
| Inputs needed | Number of chickens, Breed size |
| Main output | Coop floor space needed |
| Formula | coop area = chickens x 3.5 sq ft; run area = chickens x 9 sq ft; nesting boxes = chickens / 4 |
| Cost | Free — no sign-up, no download |
How to use the Chicken Coop Size Calculator
- 1Enter your flock size and whether you keep standard or bantam breeds.
- 2Standard guidance is about 3-4 sq ft of coop space and 8-10 sq ft of outdoor run space per bird.
- 3Add one nesting box for every 4 hens and enough roost bar length for all birds to perch comfortably.
Inputs explained
- Number of chickens
- Enter the number of chickens you are working with.
- Breed size
- Choose one of: Standard breed, Bantam (smaller breed).
Worked example
Using the values the calculator loads with:
Inputs
- Number of chickens6
- Breed sizeStandard breed
Results
- Coop floor space needed21 sq ft
- Run space needed54 sq ft
- Nesting boxes needed2
- Roost bar length (8-10 in/bird)54 in
Frequently asked questions
Can chickens have less space if free-ranged?
Yes, coop space can be reduced somewhat if birds free-range during the day, but overnight coop space still matters for safety and comfort.
How many nesting boxes do I really need?
One box per 4-5 hens is plenty since hens often share favorite boxes even if more are available.
What do I need to enter into the Chicken Coop Size Calculator?
Just 2 values: number of chickens, breed size. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Chicken Coop Size Calculator work out the answer?
Standard guidance is 3-4 sq ft of coop space and 8-10 sq ft of run space per standard-size chicken. It applies the formula coop area = chickens x 3.5 sq ft; run area = chickens x 9 sq ft; nesting boxes = chickens / 4 and shows the working so you can check each step by hand.
Is the Chicken Coop Size Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.