Hen & Herd
Duck Calculator

How much space do your ducks actually need?

Enter your flock size to get a straight answer — drawn from RSPCA guidance, not a guess.

🇬🇧 UK version/🇺🇸 US version
Standards usedRSPCA guidance
Indoor housing needed
/

2.00 m²

0.50 m² per duck × 4 ducks (RSPCA guidance)

Feed cost calculator · Water calculator · Bedding calculator · Cost of keeping calculator

What this means

A roughly square house footprint would be about 1.4m × 1.4m. Long, narrow houses work too.

If you’re building a rectangular house, examples include: 1.4m × 1.4m, 1.1m × 1.9m, 0.8m × 2.6m.

Outdoor pond/pasture access matters at least as much as floor space for duck welfare, but there's no single official land figure — the more, the better.

Working backwards: how many ducks fit?

Figures follow RSPCA guidance for pet ducks: at least 1m² of floor space for every two to three ducks — we use the more generous end (2 ducks/m²) as the conservative reading. This tool is a planning guide, not legal advice — check current rules before building.
How we calculated this +

Indoor housing needed

Applies to:
England — RSPCA guidance for pet ducks
Assumption:
Published as a range (at least 1m² of floor space for every two to three ducks), not a single per-duck figure. We use the more generous end of that range — two ducks per m² (0.5m² per duck) — as the conservative reading, the same rounding convention used elsewhere on this site.
Calculation:
0.5m² per duck × duck count.

Why there's no outdoor land figure

Source:
RSPCA, "Indoor housing for pet geese & ducks"
Applies to:
England
Assumption:
RSPCA guidance doesn't give a matching outdoor land figure the way it does for indoor space — it's explicit that more outdoor and water access is simply better, without a single defensible minimum.
Calculation:
No calculation. We don't invent a headline outdoor number to fill the gap — it's discussed in the guide on how much space a duck needs.

Sources checked: September 2026.

Rules can depend on where you live. National welfare requirements aren't the same thing as local planning, registration, nuisance or disease-control rules — check with your local authority before you build or buy.

What this means

The figure — at least 1m² of floor space for every two to three ducks — comes from RSPCA guidance for pet ducks kept indoors. We use the more generous end of that range (two ducks per m²) as the conservative reading.

RSPCA guidance doesn't give a matching outdoor land figure the way it does for goats or pigs — for ducks, more outdoor and water access is simply better, without a single defensible minimum.

Technical methodology +

The source, assumption and arithmetic behind this figure are in “How we calculated this” above.

Sources checked: September 2026.

Common questions

Do ducks need swimming water?
Ducks are much healthier with access to open water for bathing and preening, though this calculator covers floor space rather than water provision specifically — check RSPCA guidance on water access separately.
Is there an outdoor run figure too?
RSPCA guidance doesn't give a single clean outdoor land figure for ducks the way it does for indoor space — more outdoor room is simply better, so we haven't invented a headline number for it.
Can ducks live in a converted chicken coop?
Often yes for the indoor space itself, but ducks are messier with water and bedding than hens, and don't use nest boxes or perches the same way — expect more frequent cleaning regardless of whether the structure was originally built for chickens. See our duck coop vs chicken coop guide.
Can I legally keep ducks in my backyard?
Ducks clear the legal bar in more places than most backyard livestock — many residential areas that ban larger livestock outright still permit a small duck flock. The real wrinkle is water and drainage: a pond or wallow that drains onto a neighbouring property or a public waterway can trigger separate environmental or drainage rules, worth checking apart from whether the animals themselves are permitted. See our guide to keeping ducks legally.
Are ducks noisier than chickens?
Female ducks can be quite vocal, though it's usually a different kind of noise than a crowing rooster and less likely to be singled out by a noise ordinance — but it's not silent, and worth mentioning to close neighbours regardless.
How much does it cost to keep ducks?
Ducklings of common breeds commonly cost $7–15 each from a hatchery, with rare or bantam breeds running $20–60+; started or adult ducks cost more, typically $20–60 each. Feed and bedding together commonly run $100–150 a year per duck, with routine vet care adding roughly $100–150 a year on top when needed — a bit pricier per bird than an equivalent chicken, mainly down to messier water and bedding. See our duck cost guide.
Is there a version of this for the US?
Yes — see our US duck house calculator, based on Cooperative Extension guidance.

You might also need

Want to see what keeping ducks is actually like?

Try My Backyard — a simple interactive simulation. Adopt one, feed it, play with it, keep its bedding clean, and see how it gets on.

Play My Backyard →