Bird Cage Size Calculator
Get the recommended minimum cage dimensions for your species, with a scaled-up size for a bonded pair.
Recommended minimum cage — Budgie / Parakeet
Single-bird minimum: about 50 × 40 × 45 cm (~20 × 16 × 18 in), interior dimensions. Tick the box above to size up for a bonded pair.
These are floors, not targets — bigger is always better, and horizontal width matters more than height for birds that fly side to side. Bar spacing, perch variety, and safe placement matter as much as raw size.
Why cage size is the first decision
A cage is where a pet bird spends most of its life, so its size shapes everything else — how much a bird can move, whether it can stretch and flap without hitting the bars, and how much room is left for perches, toys, and foraging once the food and water are in. The minimums here come from a curated per-species table of commonly recommended sizes, measured as interior width, depth, and height.
Treat every figure as a floor rather than a target. Width usually beats height for birds that fly horizontally, and no cage substitutes for daily time out of it. Once you have the size sorted, check the bar spacing is safe for your species and fill the space with varied perches and rotating toys.
Frequently Asked Questions
How big should my bird's cage be?
Pick a cage that at least meets the minimum interior width, depth, and height for your species, then go bigger if you can. A budgie's practical minimum is roughly 50 × 40 × 45 cm, a cockatiel around 61 × 51 × 61 cm, and a macaw needs something closer to 122 × 91 × 152 cm. These are floors for a single bird kept indoors — more space is always better.
Is cage width or height more important?
For most pet birds, horizontal width matters more than height. Birds fly and move side to side rather than hovering straight up, so a long, wide cage gives more usable space than a tall, narrow one of the same volume. Height still helps for perching and climbing, but don't trade width away to get it.
How much bigger does a cage need to be for two birds?
For a bonded pair, increase the floor footprint by roughly 50% over the single-bird minimum so both birds can move freely and keep their distance when they want to. This tool widens the width and depth by about 25% each (which adds up to around 50% more floor area) and keeps the height the same.
Do these sizes replace an aviary?
No. The figures here are indoor cage minimums for pet birds that also get daily time out of the cage. A dedicated flight or aviary, where a bird can truly fly, is better still — especially for finches and canaries, which are usually kept in a long flight cage rather than handled.
Are bigger species always housed in bigger cages?
Generally yes — body size, wingspan, tail length, and activity all scale up cage needs, which is why a macaw's minimum dwarfs a budgie's. But activity level matters too: some smaller parrots are very energetic and benefit from more room than their size alone suggests.
General guidance for planning, not veterinary advice — species and individual birds vary, so consult an avian vet or experienced breeder for your specific bird.