How big should a coop be for 6 hens?

Plan at least 24 sq ft of coop floor (4 sq ft per standard hen), ideally 30–36 sq ft, plus a run of 48–60 sq ft. A 4×6 walk-in coop with an 8×8 run is the practical sweet spot for six standard-breed hens.

Are automatic coop doors worth it?

Yes — a single prevented predator raid usually offsets the $120–$200 cost. Choose a model with a light sensor rather than a timer only, since daylight shifts by roughly an hour across seasons and a fixed timer can lock a hen outside at night.

How much run space does each chicken need?

Allow 8–10 sq ft of run per standard bird. Anything under about 6 sq ft per bird leads to bare, muddy ground, higher parasite loads, and stress behaviors like feather-picking within a few weeks.

By the CoopCrafted Editorial Team · 4 min read

Best chicken coop size calculator — an honest buyer's guide

Undersize your coop and you get pecking, feather-picking, ammonia smell, and hens that stop laying. Oversize it and you've wasted $300 heating dead space in winter. The good news: coop sizing isn't guesswork. It's arithmetic. This guide gives you the actual square-footage math, then tells you which gear is worth buying once you know your numbers.

The chicken coop size calculator (the real math)

Every reliable calculator uses two separate numbers: coop floor space (where they sleep and shelter) and run space (where they roam during the day). Don't blend them.

Coop floor space per bird

4 sq ft per standard hen (Orpington, Australorp, Rhode Island Red) if they get daily run access.
2–3 sq ft per bantam.
8–10 sq ft per bird if the birds are confined to the coop most of the day (harsh winters, urban lots with no run).

So for the popular best chicken coop for 6 hens question: 6 × 4 = 24 sq ft minimum, ideally 30–36 sq ft. A 4×6 or 4×8 footprint hits that comfortably.

Chicken run size per bird

Plan 8–10 sq ft of run per standard bird. For 6 hens that's 48–60 sq ft — roughly an 8×8 run. Cramp the run below 6 sq ft per bird and you'll see bare, muddy, poop-packed ground and stressed birds within weeks.

Don't forget roost and nest math

Roosting bar: 8–12 inches of linear perch per bird. Six hens need ~5 feet of roost.
Nest boxes: one box per 3–4 hens. Six hens = 2 boxes. More boxes just get pooped in.
Ventilation: ~1 sq ft of vent opening per 10 sq ft of floor, placed high above the roost.

Matching a coop to your flock size

Manufacturer "holds 8–10 hens" claims are marketing. Assume a listed capacity is roughly half true for standard breeds. Here's how common coop classes actually stack up.

Coop type	Realistic hen count	Price band	Best for	Trade-off
Prefab wooden A-frame (advertised "4 hens")	2 standard hens	$150–$250	Bantams / 2-bird starter	Thin plywood, rots in 2–3 yrs
4×6 walk-in wooden coop	5–6 hens	$500–$900	Best chicken coop for 6 hens	Needs assembly, heavy
4×8 coop + attached run	6–8 hens	$900–$1,500	Growing flocks	Footprint needs 100+ sq ft yard
Converted 8×10 shed	12–16 hens	$1,200–$3,000 DIY	Large/laying flocks	Retrofit ventilation yourself
Mobile chicken tractor (6×10)	4–6 hens	$400–$1,000	Pasture rotation	Limited insulation, move daily

For most backyard keepers with 6 hens, the 4×6 walk-in is the sweet spot: enough floor space, tall enough to clean without crawling, and it fits a suburban yard.

Automatic chicken coop door reviews

An auto door pays for itself in one saved predator raid. The three that matter:

Run-Chicken T50 / T51

Battery-powered, light-sensor and timer modes, aluminum door. Around $150–$180. The most reliable set-and-forget option; batteries last a full season. No wiring needed. Best all-rounder.

ChickenGuard Premium

Motor unit only (~$120) — you supply the door track. Timer + light sensor, and a manual override that's genuinely useful. Good if you're building custom. The plastic housing is the weak point in freezing climates.

Omlet Autodoor

Mains or battery, horizontal-sliding door that's hard for raccoons to lever open. Pricier (~$200) but the best predator-resistant design. Fussier to install on non-Omlet coops.

Buy the door with a light sensor, not just a timer — daylight shifts an hour across seasons and a fixed timer will lock a hen out.

Best chicken feeder for a large flock

Feeder failure = wasted feed and rats. For flocks of 8+, gravity feeders spill and attract rodents overnight.

Grandpa's Feeder (treadle): Chickens step on a plate to open the lid. Rat- and wild-bird-proof, holds 20 lb. ~$130. Needs a week of training and isn't great for bantams (too light to trip it).
Royal Rooster / PVC port feeders: Rain-proof feeding ports, DIY-friendly, ~$40–$70. Best value for 6–12 hens.
Hanging galvanized gravity feeder (25 lb): Cheapest ($25) for large flocks but must come indoors at night.

Rule of thumb: one linear inch of feeding space per bird minimum, or enough ports that all hens eat without shoving.

Pre-purchase checklist

Calculated coop floor space (4 sq ft × standard hens)?
Calculated run space (8–10 sq ft × hens)?
Roost length ≥ 10 in per bird?
One nest box per 3–4 hens?
Ventilation above roost height?
Predator-proof hardware cloth (½ in), not chicken wire, on the run?
Auto door with light sensor budgeted?
Feeder capacity for 3+ days?

Takeaway

Do the math before you shop: 4 sq ft of coop and ~9 sq ft of run per standard hen. For six hens that's a 4×6 coop and roughly an 8×8 run. Ignore inflated capacity claims, spend on a light-sensor auto door and a rodent-proof feeder, and you'll build a setup that stays healthy and low-maintenance for years — not one you're rebuilding next spring.