What this calculator does
Chicken coop & run size works out minimum floor space for a flock, depending on how much outdoor access they get. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
FormulaFloor area = birds × minimum sq ft per bird for the housing style
The inputs explained
| Field | What to enter |
|---|---|
| Standard-size chickens | A number. Starts at 6. |
| Bantam chickens | A number. Starts at 0. |
| Housing style | Choose from Coop only, no outdoor run, Coop + fenced run, Free-range / open yard. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with standard-size chickens
Every other input is held at the calculator’s starting values while standard-size chickens varies. Select any row to load that scenario into the calculator.