Chicken Coop Size Calculator
Enter your number of hens to get tailored recommendations: coop floor area, outdoor run space, number of nest boxes and total perch length.
Recommendations
3.3 sq ft
Coop floor area
25.0 sq ft
Outdoor run area
3
Number of nest boxes
2.0 ft
Total perch length
Indicative recommendations based on standard poultry-keeping guidelines (approx. 3 hens per sq m of coop, 2.5 sq m of run per hen, 1 nest box per 4 hens, 20 cm of perch per hen).
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Determining the right size for your hen house
A well-sized hen house is the foundation of a healthy flock. Too small, and it encourages stress, feather pecking, and disease; too large, and it is expensive to heat and maintain. The standard recommendation is to allow adequate floor space inside and a sufficient outdoor run.
This calculator estimates the recommended hen house and run area based on your number of hens. It helps you plan a build or extension while meeting animal welfare standards.
Beyond floor space, think about perches, nest boxes, and ventilation: these are what turn a simple shelter into a truly comfortable and productive hen house.
How is the area calculated?
The calculator multiplies your number of hens by the recommended space per bird, both inside and in the outdoor run. You get a clear estimate of the dimensions required, to be adjusted for breed and climate.
Tips for a comfortable hen house
- •Allow around 20 to 25 cm of perch space per hen, at height.
- •Plan one nest box for every three to four hens, in a quiet, sheltered spot away from direct light.
- •Ensure good ventilation without creating draughts directly on the hens.
- •Set up a grassed and predator-proof outdoor run.
Frequently asked questions about hen house size
How much space do 10 hens need?
Allow adequate indoor floor space plus a much larger outdoor run; the calculator gives you an estimate tailored to your flock size.
How many hens per square metre?
Three to four hens per square metre inside is a common recommendation, with fewer for greater comfort and hygiene.
Is an outdoor run necessary?
Yes, a run improves welfare, health, and egg quality. The larger and more grassed it is, the better.
How many nest boxes are needed?
One nest box for every three to four hens is generally sufficient, placed in a quiet, dark spot.