Cage Bar Spacing Guide
Check the safe cage bar spacing range for your species, in millimetres and inches.
Safe bar spacing — Budgie / Parakeet
Aim for cage bars spaced roughly 9.5–12.7 mm apart for a budgie / parakeet. Spacing that is too wide lets a small bird push its head through and become trapped, or squeeze out; too narrow and toes or a beak can catch. When in doubt between two cages, the narrower spacing is the safer choice.
Getting bar spacing right
Bar spacing is one of the easiest cage specs to overlook and one of the most important for safety. The single greatest risk is head entrapment: a small bird that can push its head between two bars can become stuck or injure its neck trying to pull free. That is why finches and budgies need much narrower spacing than a macaw, whose danger is the opposite — thin, closely spaced bars a powerful beak can bend.
The ranges here come from a curated per-species table of commonly recommended spacings. When a cage listing quotes spacing in inches, use the inch figures; when it quotes millimetres, use those. If your bird's size sits between two species, err toward the narrower spacing.
Frequently Asked Questions
What bar spacing is safe for my bird?
It depends on species. As a rough guide, finches need about 6–9.5 mm, budgies and lovebirds around 9.5–12.7 mm, cockatiels and conures roughly 12.7–16 mm, African greys and cockatoos about 19–25 mm, and macaws 25–38 mm. Pick a cage whose bar spacing falls in your species' range.
Why is bar spacing so important?
Spacing that is too wide lets a small bird push its head between the bars and get its head or neck trapped — a real injury and escape risk — or squeeze out entirely. Spacing that is too narrow for a larger bird can catch toes or a beak. Matching the spacing to the species keeps a bird safely contained without pinch points.
What if I'm between two cages?
When a bird's size falls between two spacings, choose the narrower one. It's safer to have bars slightly closer together than to risk a head slipping through a gap that's a touch too wide.
Does bar orientation matter too?
It can. Horizontal bars give climbing birds like parrots something to grip and clamber on, while purely vertical bars are harder to climb. Bar thickness also matters for big parrots — a strong beak can bend or spring thin bars regardless of spacing.
Is bar spacing the same as the gap I should leave between perches?
No — bar spacing is the gap between the vertical or horizontal wires of the cage itself, which is what this guide covers. Perch placement and spacing are a separate consideration driven by the cage size and your bird's movement.
General guidance for planning, not veterinary advice — species and individual birds vary, so consult an avian vet or experienced breeder for your specific bird.