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Bird Cage Size Calculator

Minimum cage dimensions and safe bar spacing for eleven species, from finches to macaws, in inches and centimetres.

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Open Bird Cage Size Calculator and you get an answer straight away, with no account to create. You will find it under Pets & animals, with Pet Travel Crate Size Calculator and Aquarium Heater Wattage Calculator for the neighbouring cases.

How to use it

  1. Open the tool — no signup or install needed.
  2. Enter your input or adjust the available options.
  3. Get your result instantly, then copy or download it.

Frequently asked questions

What does Bird Cage Size Calculator do?

Minimum cage dimensions and safe bar spacing for eleven species, from finches to macaws, in inches and centimetres.

When would I actually use this?

Day-to-day care: how much to feed at a given weight, whether a size is right for the breed, and what a life stage means in human terms.

What is the most common mistake?

Using the seven-years rule for a dog's age. Ageing is fast in the first two years and then slows, and it slows much more for a small breed than for a large one — the multiplier is not a constant.

How is Bird Cage Size Calculator different from Pet Travel Crate Size Calculator?

They sit next to each other but answer different questions. Pet Travel Crate Size Calculator: size an airline crate for a dog or a cat with the IATA formula — length A + ½B, width 2C, height D — in both sizing systems: the US 100–700 series and the European Atlas 10–80, in inches and cm. Pick whichever matches what you're starting from — both are free.

Is there a tool for the next step?

Aquarium Heater Wattage Calculator is the closest one after this: Find the heater wattage your tank needs from its volume, the target water temperature and the coldest room temperature.

What else is worth having open alongside it?

Aquarium Substrate Calculator and Cat Calorie Calculator — they come up in the same task often enough to be worth a second tab.

Where do the figures come from?

Portions follow published feeding guidelines by species and weight; age equivalences use the size-dependent curves rather than a flat multiplier. None of this replaces a veterinarian, especially for an animal that is unwell.

Further reading

All guides →
GuideBar Spacing Is the Cage Rule That Actually MattersA budgie needs bars 10 to 13 mm apart and a macaw 25 to 38. Put the budgie in the macaw cage and it can get its head through — the size is a welfare question, the spacing is a safety one.ExplainerFerguson Zones, and the Lamp Distance They ImplyThe same Ferguson zone 3 puts a compact lamp 18 to 30 cm above the basking site and a 54 W tube 74 to 127. The zone describes the animal; the distance belongs to the lamp, and a mesh screen moves it again.How-toThe IATA Crate Formula an Airline Measures at Check-InLength A + half B, width twice C, height D. The width rule is the one that fails people: a dog with 28 cm shoulders needs 56 cm of interior width, and no crate sold by weight rating tells you that.How-toHow Much Substrate Does an Aquarium Need? Depth, Weight and Grain SizeThe depth follows the job: a bare display, a planted tank whose roots need room, an under-gravel plate. Then comes the number people are unprepared for — substrate is what puts a filled tank past what a piece of furniture can hold. Plus why fine sand compacts and coarse gravel traps waste.How-ton + 1 Litter Boxes, and What the Litter Actually CostsTwo cats need three boxes, not two, and each should be one and a half body lengths long — 69 cm for an average adult. The litter figure that follows is larger than most people expect, and knowing why is the useful part.ExplainerHow Many Fish Can a Tank Hold? The Inch-per-Gallon Rule Is WrongEvery stocking calculator implements a length-per-volume rule, and waste output scales with body mass, not length. A fish twice as long makes nearly five times the ammonia. Run through the tool's five methods, the same tank comes back holding anywhere from 6 to 12 fish.