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Bird Cage Size Calculator

Enter your bird's wingspan and the number of birds to get the minimum cage size.

How it is calculated

Every dimension is scaled from the wingspan W (cm, tip to tip with the wings open) and the number of birds n (a whole number from 1 to 20). With s = 1 + 0.1 × max(0, n − 2): width = 2 × W × s, depth = 2 × W, height = 2 × W. Floor area is width × depth in cm², and volume is floor area × height ÷ 1000, in litres. Only the width grows with extra birds, by 10% of the base width for each bird beyond two (the RSPCA suggests 5-10% per bird). Dimensions are rounded to whole centimetres. A wingspan of zero, a negative one or one above 300 cm, a fractional bird count such as 2.5, and more than 20 birds all give no result. These are minimums from one wingspan-based rule, not a species-specific standard.

Worked example

A bird with a 30 cm wingspan, two birds. Scale factor: 1 + 0.1 × max(0, 2 − 2) = 1.0. Width: 2 × 30 × 1.0 = 60 cm. Depth: 2 × 30 = 60 cm. Height: 2 × 30 = 60 cm. Floor area: 60 × 60 = 3,600 cm². Volume: 3,600 × 60 ÷ 1000 = 216 L. Result: 60 × 60 × 60 cm, floor area 3,600.00 cm², volume 216.00 L. With three birds the width grows to 66 cm.

Try this example →

Common mistakes

  • Entering body length instead of wingspan. The input is the tip-to-tip span of the open wings, which is usually much larger than the body.
  • Typing the wingspan in millimetres or inches. The tool reads centimetres, so 3 for a 30 cm bird gives a cage only 6 cm wide.
  • Entering a fraction of a bird such as 2.5. Birds are counted in whole numbers, so the tool shows no result until you enter 2 or 3.
  • Expecting depth and height to grow with each extra bird. Only the width increases; depth and height depend on the wingspan alone.
  • Treating the output as an ideal size. It is a minimum for a bird that mostly climbs and hops, and perches and toys still take room inside it.

Sources

About this calculator

Minimum cage sizing for pet birds is generally based on wingspan rather than body length, since the bird needs enough width and depth to fully extend and flap its wings without hitting the bars — a common rule of thumb calls for a cage at least twice the bird's wingspan in width, depth and height, with more room needed for species that fly actively rather than climb, and additional space added per extra bird when housing more than two (here, each bird beyond two adds 10% to the width, within the 5-10% per bird that the RSPCA suggests).

Bird owners and avian veterinarians recommend sizing by wingspan because cages sold by species name alone can vary widely in suitability — a cage marketed for "small birds" might be adequate for a budgie's roughly 25–30 cm wingspan but badly undersized for a larger conure or cockatiel. Cramped housing is linked to feather damage, muscle atrophy and behavioral problems in birds that don't get enough flight and movement.

From your bird's wingspan and how many birds share the cage, it gives the minimum width, depth and height, along with the floor area and volume that leaves them.

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