How big should a chicken coop be for 6 hens?
24 sq ft inside, 60 sq ft of run, 5 feet of roost bar, 2 nesting boxes — one formula, four numbers, no marketing nonsense.
The formula from the extension services
These aren't hobby-forum numbers — 4/10 is the standard published by state extension services, and it's driven by behavior: chickens crowded below it start feather-pecking, egg-eating, and bullying the bottom of the pecking order. The minimum is a floor, not a target.
The six-hen spec, line by line
| Spec | 6 hens | Why |
|---|---|---|
| Coop floor | 24 sq ft | 4 sq ft/bird; e.g. 4×6 ft |
| Run | 60 sq ft | 10 sq ft/bird; e.g. 6×10 ft |
| Roost bar | 4–5 ft | 8–10 in/bird, flat 2×4, not round |
| Nesting boxes | 2 | 1 per 3–4 hens, 12×12×12 in |
| Ventilation | 2.4+ sq ft, high | 1 sq ft vent per 10 sq ft floor; see the winter guide |
| Pop door | 10×12 in | One up, one down comfortably |
The full flock-size chart
| Flock | Coop | Run | Roost | Boxes |
|---|---|---|---|---|
| 3 hens | 12 sq ft | 30 sq ft | 2.5 ft | 1 |
| 6 hens | 24 sq ft | 60 sq ft | 5 ft | 2 |
| 8 hens | 32 sq ft | 80 sq ft | 7 ft | 2–3 |
| 12 hens | 48 sq ft | 120 sq ft | 10 ft | 3–4 |
| 20 hens | 80 sq ft | 200 sq ft | 17 ft | 5–6 |
The prefab-label trap
Coops marketed as "fits 6–8 chickens" routinely measure 12–16 sq ft inside — half the standard. Manufacturers size labels to buyer optimism, not bird behavior. The fix is mechanical: read the interior dimensions, divide by 4, and that's the true bird count. Our best coops for 6 hens guide applies exactly that test to the 2026 prefab market — anything genuinely 24+ sq ft for six birds runs $600–1,200, and sub-$400 "cute" coops essentially never qualify.
Run size when chickens free-range
True free-ranging (out most of the day, supervised) lets you shrink the run toward 5–8 sq ft/bird — but never the coop. Birds are locked in every night and every winter evening, and 4 sq ft inside holds regardless of how much lawn they own by day. A 60 sq ft predator-proofed run plus supervised yard time is the comfortable six-hen setup; "free-range" with no run at all usually ends in a raccoon census.
Sizing up on purpose
Three reasons real builders land above the minimum:
- Chicken math is real. Almost everyone who starts with 6 ends up with 8–10 within two years. Building 32 sq ft now costs less than adding later.
- Winter floor space shrinks. Deep-litter bedding, feeders, and the waterer all live indoors December–March — 24 sq ft of open floor becomes ~20 fast.
- Integration space. New birds need room to escape the established pecking order; cramped introductions turn bloody.
A 4×8 ft shed-style coop (32 sq ft) with a 6×12 run is the sweet-spot six-hen build: above minimum, standard lumber sizes, one sheet-goods-friendly footprint.
The spec list maps directly to hardware: 1/2-inch hardware cloth, predator-proof two-step latches, flat roost bars, and 12×12 nesting boxes.
After the coop: the monthly math
Size is the one-time decision; feed is the forever one. Six hens eat roughly 46 lb of layer feed a month — about one 50 lb bag — and the feed cost guide breaks that down per flock size, per egg, and per brand. The coop calculator handles any flock size in one step.
FAQ
How big should a coop be for 6 hens?
24 sq ft inside (4 sq ft/bird) plus a 60 sq ft run (10 sq ft/bird), with about 5 ft of roost bar and 2 nesting boxes. That's roughly a 4×6 coop on a 6×10 run — and building 32 sq ft instead covers the flock growth that's coming anyway.
Can 6 chickens live in a small prefab coop?
Almost none sold as "6–8 bird" coops actually offer 24 sq ft inside — most are 12–16. Divide the listed interior dimensions by 4 to get the true capacity. Real six-hen prefabs run $600–1,200.
Do bantams need less space?
Yes — 2 sq ft/bird indoors and 8 sq ft/bird in the run is the accepted bantam standard. Six bantams fit a 12 sq ft coop; the nesting and roost specs barely change.
Sizing tools for the rest of the homestead: GeneratorSizer ↗, SolarSizer ↗, Battery Bank Sizer ↗.