Chicken Run Size Calculator: the complete guide
Crowded runs cause feather picking, bullying, bare muddy ground and disease. This calculator sizes the run from flock size, breed size and how many hours a day the birds get out to free range.
How the chicken run size calculator works
- The baseline is 10 sq ft of run per standard bird. Bantams need around 8, heavy breeds closer to 12 to 15.
- Free range hours reduce the fixed run requirement, because pressure on the ground drops when birds spend part of the day elsewhere.
- There is a floor: even birds that range all day need a secure run for bad weather, lockdowns and predator season.
How to use it
- Enter the total number of birds that will use the run.
- Pick breed size so heavy birds get their extra footprint.
- Set average free range hours per day across the week, not the best case day.
- Use the total square footage to pick run dimensions, for example 80 sq ft as 8 x 10.
Step by step examples
Eight standard hens, fully enclosed
Eight birds at 10 sq ft each is 80 sq ft, so an 8 x 10 run.
Eight hens with six hours of supervised ranging
The same flock can use a smaller fixed run, around 56 to 64 sq ft, but keep the shape long rather than square so birds can move away from each other.
Recommended values
| Item | Value | Notes |
|---|---|---|
| Standard breed, confined | 10 sq ft per bird | |
| Bantam | 8 sq ft per bird | |
| Heavy breed | 12 to 15 sq ft per bird | |
| Run fence height | 6 ft, covered on top | |
| Hardware cloth apron | 18 to 24 inches out from the base |
Common mistakes
- Using chicken wire for the walls. It keeps chickens in but does not keep raccoons or dogs out. Use half inch hardware cloth.
- Leaving the run uncovered where hawks hunt.
- Building square when long and narrow gives bullied birds an escape route.
- Ignoring drainage, which turns any run into mud by the second wet month.
- Sizing for today's flock and forgetting that flocks always grow.
Frequently asked questions
How much run space does a chicken need?
Ten square feet per standard bird is the usual minimum for a fully enclosed run. More is always better.
Does free ranging reduce the run size I need?
Yes, but do not go below a secure base run. Weather, predators and avian flu lockdowns all mean birds get shut in sometimes.
How tall should a chicken run be?
Six feet lets you walk in, and a covered top stops hawks and climbing predators.
Related calculators
What next?
Free tools that pair well with this calculator.