Chicken Coop Size Calculator

Enter how many birds you keep, how big they are and whether they get a run, and this returns the coop floor area, the run area, the length of roost perch, the number of nest boxes and the ventilation opening. A second tab works the other way, taking the coop and run you already have and saying how many birds that supports and which of the two is the limit. Every per-bird allowance it uses is printed on the result and the two biggest can be overridden. These are husbandry figures rather than a building code, and crowding is what causes feather pecking, so round up.

Calculator Type

Units

Feet and square feet Metres and square metres

Number of Birds *

Bird Size

How They Are Kept

Birds shut in all day need far more floor than birds with somewhere to go.

Coop Floor per Bird (0 to use the guideline)

Square feet, or square metres in metric.

Run Space per Bird (0 to use the guideline)

Square feet, or square metres in metric. Eight to ten square feet a bird, which is about 0.75 to 0.95 square metres, is the usual range for a standard hen. More is better; a bare, overstocked run turns to mud.

Hens per Nest Box

One box for every four to five hens is the usual figure. Hens queue for a favourite box whatever you build.

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Units

Feet and square feet Metres and square metres

Coop Inside Length (ft) *

Coop Inside Width (ft) *

Floor the birds can stand on. Take off anything the nest boxes and the feeder sit on if they are at floor level.

Run Length (ft, 0 if there is no run)

Run Width (ft)

Bird Size

How They Are Kept

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