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Enter your values and press Calculate.
Enter the number of birds, the floor space you want per bird in square feet, and the aviary height in feet. The calculator gives the total floor area, the aviary volume, the perch count (one per bird plus two extras, following indoor aviary guidance), and the feeding stations needed (two, or three for flocks over four birds or with a known bully). Use the species table below to pick a sensible floor space per bird: small finches need far less than macaws. These are planning estimates, not veterinary advice.
Floor area = birds × floor space per bird. Aviary volume = floor area × aviary height. Perches = birds + 2, because every bird needs a perch plus spares so no bird is forced to perch beside a rival. Feeding stations = 2 for up to 4 birds, otherwise 3, so a dominant bird cannot guard all the food.
Worked example: 4 birds at 10 sq ft each need 40 sq ft of floor. At 6 ft high the volume is 240 cu ft, with 6 perches and 2 feeding stations. For 6 birds at the same allowance the floor is 60 sq ft, the volume is 360 cu ft, with 8 perches and 3 feeding stations. Aviary size for 4 cockatiels and aviary size for 10 finches both follow the same formula: only the floor space per bird changes.
Count the birds that will live in the aviary together, including any you plan to add soon, since adding birds later to a tight aviary causes fights. Pick floor space per bird from the species table below: 8 to 10 sq ft suits small birds, 20 to 30 sq ft suits cockatiels, and 50 sq ft or more suits large parrots. Enter the height you can actually build: an aviary should allow a flight length of 10 to 15 ft in one direction where possible, so a long rectangle beats a square of the same area. Press Calculate and check the floor area against the room or garden space you have. Use the species figures in this guide as your aviary size chart, and write down your chosen aviary dimensions before you buy mesh or panels.
Aviary size for budgies and finches starts small: a pair of small birds suits a 6 ft by 4 ft by 6 ft aviary, and aviary size for finches in a group works from about 8 to 10 sq ft per bird. Aviary size for cockatiels needs more: about 20 to 30 sq ft per bird, with a pair suiting a 10 ft by 5 ft by 7 ft aviary. Conures and small parrots need about 12 ft by 6 ft by 8 ft for a pair, and what size aviary for two conures is best answered as at least that footprint, not a cage. Aviary size for African grey and Amazons runs to 50 sq ft or more per bird, and aviary size for macaws runs larger still, with long tails needing width as well as height. Minimum aviary size for a pair of parrots is therefore not one number: it depends entirely on the species group.
Square feet per bird is the honest way to compare aviary advice: small birds 8 to 10 sq ft, cockatiels 20 to 30 sq ft, large parrots 50 sq ft or more, cockatoos 75 to 100 sq ft or more. For flocks, indoor aviary guidance adds roughly 25 to 40 percent more floor area for each bird beyond the first pair, because flock birds need escape routes, not just standing room. A worked flock example from that guidance: a pair of conures fits in 24 sq ft, a third bird needs 30 to 34 sq ft, and a fourth needs 38 to 42 sq ft. If your calculator result feels small for a mixed flock, use the higher end of the range and add sight barriers between territories.
What bar spacing for budgies in an aviary is safe? About 0.375 to 0.5 inches for budgies and finches, 0.5 to 0.625 inches for cockatiels and lovebirds, 0.625 to 0.75 inches for conures and quakers, and 0.75 to 1 inch for ringnecks, small macaws, Amazons and African greys. Cockatoos and large macaws need 1 to 1.5 inches. Bars too wide let small birds escape or get stuck, and bars too narrow for a large parrot invite chewing damage. Mesh must be bird-safe and chew-resistant: heavy chewers need reinforced corners, and galvanised mesh must be properly treated or it can poison birds.
How much flight space do birds need? An aviary should allow 10 to 15 ft in a single flight line, unobstructed by perches or feeders, so birds can actually fly rather than hop. Perches follow the one-per-bird-plus-two rule at staggered heights, for example 7 ft, 5 ft and 3 ft in a tall aviary, with enough clearance that a perched bird can spread its wings without touching a neighbour. Feeding stations need the same thinking: two stations for small flocks, a third for flocks over four birds or where one bird bullies, placed apart so no single bird can guard both. Water, bathing and foraging stations sit separately from food to cut contamination.
Indoor aviary size is limited by the room, so a walk-in aviary size of at least 6 ft wide by 8 ft tall by 4 ft deep for two medium birds is a useful indoor benchmark. An outdoor aviary size can be larger and should be at least 60 cm in any direction with the top at least 1.5 m above ground under Australian codes, with a sheltered, draught-free corner and a roof over part of the flight. A flight aviary size prioritises length over height, while a tall show aviary prioritises display: birds prefer wide aviaries over tall ones, because they fly horizontally. Whichever type you build, the floor area from this calculator is the figure that must fit your space.
Cage charts and aviary tables disagree sharply: a pair of budgies ranges from a cage of 18 by 18 by 24 inches to an aviary of 8 by 4 by 6 ft across the sources researched. Cage minimums are not aviary minimums, and single-bird cage charts scaled by the square root of bird count understate flock needs. Trust aviary-specific guidance for aviaries, use cage charts only for cages, and treat any table that gives one number for all species as a warning sign. This calculator keeps the two apart: it sizes a flight aviary from floor space per bird, and the species table above labels each figure by species group.
Divide the aviary floor area by the floor space per bird for the species. A 6x4 aviary has 24 sq ft, which suits a pair of conures or about two to three small birds at 8 to 10 sq ft each, but only a pair of small birds comfortably if they also need flight length. Mixed species need more room and sight barriers.
It depends on species and flock size. A pair of small birds needs at least a 6 ft by 4 ft by 6 ft aviary, cockatiels need about 10 ft by 5 ft by 7 ft, and large parrots need 12 ft by 6 ft by 8 ft or more. Use this calculator with the species table to size your exact flock.
Budgies and finches need bar spacing of about 0.375 to 0.5 inches. Wider spacing risks escape or injury, and smaller birds in a large-parrot aviary are unsafe. Match the mesh to the smallest bird in the aviary.
Birds prefer wide aviaries: they fly horizontally, so a long flight line of 10 to 15 ft matters more than extra height. Height still matters for perches at staggered levels and for long-tailed species, but never trade flight length for height.
Yes for small, quiet species in a modest indoor aviary, provided neighbours, noise, dust and cleaning are managed. Large parrots and loud species are a poor fit for apartments, and any indoor aviary needs good lighting, ventilation and a cleaning routine you can sustain.
Quarantine the new bird first, then introduce it gradually with sight barriers and extra feeding stations so established birds cannot guard all the food. Watch for bullying in the first days, and have a separate cage ready if the new bird is attacked or cannot feed.
A pair of conures suits an aviary of about 6 ft by 4 ft by 8 ft at minimum, with 24 sq ft of floor as the planning figure. Add a third conure and the floor rises to about 30 to 34 sq ft, and a fourth to about 38 to 42 sq ft.
An aviary should allow 10 to 15 ft in a single unobstructed flight line. Shorter flights still exercise birds, but a true flight aviary is measured by that straight line, not by total volume.
A 6 ft by 4 ft aviary has 24 sq ft of floor. At 8 to 10 sq ft per small bird that is two to three budgies for comfortable flight, though some guides house more in the same footprint. For welfare, fewer birds with real flight room beats a crowded aviary.
Sealed, washable flooring with a droppings tray or easy-clean substrate works best indoors. Avoid loose dusty substrates near the birds' breathing zone, keep food and water off the floor, and clean daily: indoor aviaries smell and spread disease fast when cleaning slips.