Calculate what size terrarium or birdcage you need.
Enter the species and the approximate adult size of your reptile or bird, and find out the minimum recommended dimensions. No sign-up, no data stored.
Terrarium & Birdcage Size Calculator
Based on Real Species Needs
We factor in adult size, activity level and natural behavior for each species.
Reptiles and Birds
Covers both terrariums for reptiles and cages for pet birds.
Instant Result
Enter your data and get the minimum dimensions instantly.
No Sign-Up, No Waiting
The calculation happens in your browser. No accounts or passwords.
Too little space limits your pet’s wellbeing.
Reptiles and birds need enough space to move, fly or explore according to their natural behavior, and a terrarium or cage that’s too small can cause stress, behavioral problems and even physical illness. Generic reference charts don’t always account for a species’ real adult size, so calculating it before buying helps you get it right from the start.
What result do you get?
Before buying the terrarium or cage:
Work out what size you need before choosing it, not after.
When adopting a new species:
Check whether your current terrarium or cage is suitable.
If your pet is still growing:
Check whether it will need more space once it reaches adult size.
Frequently Asked Questions (FAQ)
Do I need to create an account?
No, never. You can use the calculator directly, with no sign-up or passwords.
Does it work for both reptiles and birds?
Yes, the calculator covers both cases, adjusting recommendations depending on whether it’s a terrarium or a birdcage.
What if my pet is still young?
We recommend calculating the size based on its expected adult size, not its current one, so you don’t have to change terrariums or cages later.
Does this calculator replace a specialist’s advice?
No. It only gives general guidance. For specific questions about your pet, consult a specialized store or an exotic animal veterinarian.