The adult Khaki Campbell, in pounds and inches
A fully grown Khaki Campbell hen weighs about 4 to 4.5 pounds, and a drake about 4.5 to 5 pounds. The body is compact and carried fairly upright, with a slim neck and a neat, streamlined outline under that khaki-brown feathering. In practical terms a Campbell is roughly the size of a large laying hen, only longer in the body and lower in stance once it settles. There is no heavy breast or broad meat-duck bulk on this breed at any age.
Why Campbells stay on the small side
Khaki Campbells were developed as specialist laying ducks, and selection favoured egg output over carcass size. A light frame supports that job: the bird converts feed into eggs rather than into extra body mass, stays active on its feet, and keeps foraging keenly through the laying season. Tight feathering and a naturally lean build add to the impression, so a healthy adult Campbell looks athletic rather than plump. A bird that feels noticeably heavy and waddling at this size is usually carrying condition it does not need.
Housing and handling sized for a 4-to-5-pound duck
A grown Campbell needs far less infrastructure than a heavy breed. A modest run suits a small group, shelter can be low and simple because the birds do not roost up high, and swimming water can be a shallow trough or small tub they can climb out of easily. Their light weight makes routine care easy: one hand under the body lifts a hen comfortably for checking feet, vent, and feather condition. The flip side of small size is vulnerability, so spend effort on predator-proof fencing, a lockable night house, and cover from above rather than on floor area.
How fast a Campbell reaches full size
Campbell ducklings grow quickly through their first weeks, and most of the adult frame is in place by about four months. Birds continue to fill out and condition up after that, reaching a settled adult weight closer to five or six months, which is also around when young hens typically come into lay. A duckling that lags well behind its hatch-mates in size deserves a closer look at feed access and general health rather than an assumption that it will simply catch up later.
How a Campbell's size compares on a typical shortlist
Set against the ducks it is usually chosen between, the Campbell's size is its defining convenience. It is barely half the weight of a Pekin and a third the weight of a big Muscovy drake, yet it out-lays both by a wide margin. A keeper with limited space who wants eggs rather than meat gets a genuinely productive bird in a 4-pound package, and feed bills follow body weight: a flock of Campbells eats noticeably less than the same number of heavy ducks. The honest trade is table value, because a spent Campbell hen is a small carcass, and keepers who want one breed to do both jobs should look at mid-weight ducks instead.
What to check when choosing adult Campbells
When you are choosing grown birds, pick each one up. A healthy adult Campbell should feel solid for its size without being fat, with bright eyes, clean feathers, and sound legs and feet. Ask the seller about age and laying history, because two ducks of identical weight can be at very different points in their productive lives. If those started birds come home with you, KinsLe Transferrable Profiles carry each Campbell's profile across to your name with its age, weight, and laying record preserved, so the history the breeder kept is not lost at the gate.