Poultry Coop Space Calculator
Tells you how much coop floor space — and run space, where extension publishes a figure — ducks, turkeys, geese, and chickens need.
Figures reviewed against university extension guidance · Last reviewed July 2026
- Coop / shelter floor space
- 30 sq ft
- interior, floor level
- Run space
- No set minimum
- extension gives no figure — bigger is better
Space per bird, by species
Six ducks in a confined setup need a 30 sq ft coop — but the same table shows why you can't just reuse a chicken plan for other birds. Ducks, turkeys, and especially geese all need more floor space than a laying hen.
| Bird | Coop floor (per bird) | Run (per bird) |
|---|---|---|
| Chickens (laying hens) | 4 sq ft | 10 sq ft |
| Ducks | 5 sq ft | No published figure |
| Turkeys | 6 sq ft | 20 sq ft |
| Geese | 15 sq ft | No published figure |
How this calculation works
Every figure here comes from one publication: Poultry Extension's "Space Allowances in Housing for Small and Backyard Poultry Flocks." It gives indoor floor space per bird as 4 square feet for a laying hen, 5 for a duck, 6 for a turkey, and about 15 for a goose — geese needing roughly three times a duck's room. Multiply by your flock size and you have the coop floor area.
Run space is where the sources go quiet. The same article gives a per-bird run figure only for chickens (10 sq ft) and turkeys (20 sq ft). For ducks and geese it says only that "the larger the run the better" — no number. Rather than invent one, this calculator tells you plainly that there's no published minimum and leaves the size to your space. That honesty is the point: a fabricated duck run figure would look authoritative and be worth nothing.
Waterfowl are not just bigger chickens. Duck and goose droppings are around 90 percent water, so they load the coop with far more moisture than chickens do — the main reason they need more floor space, dry bedding, and strong ventilation. They also sleep on the floor rather than roosting on a bar, and they use ground-level nest areas instead of the elevated boxes hens like, which is why this tool reports floor and run space only, not roost length or nesting boxes. If you keep chickens, theCoop Size Calculatoradds roost length and box counts on top.
A worked example
Say you're planning four turkeys with a run. Floor space is 4 × 6 = 24 square feet inside, and 4 × 20 = 80 square feet of run — a noticeably bigger build than four chickens, which would need just 16 sq ft of coop and 40 sq ft of run. Size the housing for the birds you're actually keeping, not the chicken numbers everyone quotes by default.
Sources
- Poultry Extension (Small and Backyard Flocks) — Space Allowances in Housing for Small and Backyard Poultry Flocks
Frequently asked questions
- How much coop space do ducks, turkeys, and geese need?
- Per adult bird, Poultry Extension recommends about 5 square feet of indoor floor space for a duck, 6 for a turkey, and roughly 15 for a goose — against 4 for a laying chicken. Bigger birds and messier birds need more room, and geese need the most by a wide margin.
- How big should a duck run be?
- There is no published per-duck run figure — Poultry Extension says only that "the larger the run the better." So this calculator gives you the coop floor space for ducks but deliberately won't print a run number it can't source. In practice, give ducks as much outdoor room as you can, and keep their water out in the run rather than in the coop.
- How much run space does a turkey need?
- About 20 square feet of outdoor run per turkey, twice what a chicken gets, per Poultry Extension. Turkeys are large, active birds, so for six turkeys that is roughly 120 square feet of run on top of the 6 square feet each of indoor space.
- Do ducks and geese need roosts and nesting boxes like chickens?
- No — ducks and geese are ground birds that sleep on the floor rather than perching on a roost, so this tool doesn't calculate roost length for them. They will use floor-level nest areas but not the elevated 12-inch boxes chickens prefer. If you keep chickens, the Coop Size Calculator adds roost length and nesting-box counts on top of the floor space.
- Why do ducks and geese need more coop space than chickens?
- Partly body size, but mostly moisture. Waterfowl droppings are around 90 percent water, so a duck or goose puts far more dampness into the coop than a chicken does. More floor space per bird, dry bedding, and good ventilation are how you keep that moisture from turning into wet litter and respiratory problems.
- Can I keep the same number of birds in a smaller space if they free-range?
- Free-ranging removes the fixed run requirement, since the birds forage your yard instead of an enclosed run — but the indoor coop floor space stays the same, because the flock still shelters and sleeps inside. Overcrowding the coop causes the same trouble in waterfowl and turkeys as it does in chickens.