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Estimate minimum indoor coop floor area and outdoor run square footage from your flock count and planning targets for square feet per bird. Use results to sketch footprints before drafting doors, roosts, and nest boxes.
Last updated: April 17, 2026
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Coop interior resting space per bird.
Attached run or paddock space per bird.
Min Indoor Floor
24.0 sq ft
Min Run Area
60.0 sq ft
Indoor + run (separate areas):
84.0 sq ft
Square coop footprint hint (indoor):
~4.9 ft per side
Planning notes:
Coop interior
birds × indoor / bird
Run sizing
birds × run / bird
Geometry hint
√ indoor sq ft
Six hens, 4 sq ft indoor each, 10 sq ft run each — minimum indoor floor about:
24.0 sq ft
The calculator multiplies your flock count by your chosen indoor square feet per bird to estimate a minimum coop floor area. It separately multiplies flock count by run square feet per bird to estimate a minimum outdoor run area. The square side length is the square root of the indoor floor area, useful as a quick footprint check for simple layouts.
indoorSqFt = birds × indoorPerBirdrunSqFt = birds × runPerBird~4.9 ft per side
If the coop interior were square with the same floor area as the minimum.
Share it with homesteaders planning backyard coops and runs.
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