Small Pet Cage Size Calculator
Small pet cages sold in shops are often far smaller than welfare organisations recommend, which can leave hamsters, gerbils, guinea pigs and rabbits without enough room to move, exercise and behave naturally. Choose your pet type below to see the minimum floor space you should be looking for.
Find the minimum cage size for your pet
Pick your pet type and how many you're housing together to see the minimum recommended space.
Minimum recommended floor space for 1 hamster (syrian/dwarf):
80cm × 50cm
This is a minimum — bigger is always better for your pet's welfare. Hamsters are solitary and should be housed alone in most cases.
Recommended products
A few well-reviewed small pet cages and hutches.
£45.99
Pros
- Modular tubes and platforms for enrichment
- Deep base traps bedding mess
- Easy-clip roof for quick cleaning access
Cons
- Bar spacing unsuitable for very young hamster pups
£83.60
Pros
- Spacious base gives guinea pigs room to roam
- Slide-out tray for fast cleaning
- Ventilated top keeps air circulating
Cons
- Flat-pack assembly takes around 30 minutes
£89.99
Pros
- Natural willow materials are safe to chew
- Part of the Rosewood Boredom Breaker range for small pets
- Encourages natural foraging and chewing behaviour
Cons
- Premium bundle price versus buying toys separately
Frequently asked questions
Is bigger always better for a small pet cage?
Yes — the figures given here are minimums, not targets. A bigger enclosure gives your pet more room to exercise, explore and express natural behaviours, which generally means a happier, healthier animal.
Can I keep two hamsters together in a larger cage?
No — Syrian and dwarf hamsters are solitary and will fight if housed together regardless of cage size, so each hamster needs its own separate enclosure rather than a bigger shared one.
Do guinea pigs really need more space per additional pet?
Yes — guinea pigs are social animals that do best living in pairs or small groups, but each additional guinea pig needs its own share of floor space to avoid overcrowding and squabbling over resources.
Why does a rabbit hutch need a run as well?
A hutch alone, even a large one, does not give a rabbit enough room to run, binky and stretch out fully, so a daily-accessible run is considered essential alongside the hutch rather than optional extra space.
How this calculator works
The calculator begins by asking you to select your small pet species: Hamster, Gerbil, Guinea Pig or Rabbit. Each species has a pre-calculated minimum volume requirement based on average adult weight and general activity levels. The calculator then multiplies these figures to arrive at the suggested minimum internal cage dimensions in cubic metres (m³).
We’ve assumed that 'active' means the pet spends a significant portion of its time moving around within the cage, while ‘moderate’ suggests a more relaxed lifestyle with less strenuous activity. The calculations are based on providing adequate space for movement, feeding, and resting – factors which can significantly impact your pet’s happiness and health.
Recommended Cage Dimensions by Species (UK)
- **Hamsters:** Typically require a minimum of 0.45m³ (45 litres) – ideal for Syrian hamsters, smaller breeds may need slightly less. Consider a wire cage with a solid base or a plastic bin cage.
- **Gerbils:** Need around 0.6m³ (60 litres) to thrive; gerbils are social animals and often benefit from housing them together in a larger enclosure.
- **Guinea Pigs:** Require at least 0.75m³ (75 litres), especially important for larger breeds like the Texel or Silver. Provide plenty of space for foraging and exploring, alongside a companion.
- **Rabbits:** Adult rabbits need a minimum of 1.2m³ (120 litres) – particularly vital for lop-eared varieties which have restricted movement. A large hutch with an attached run is highly recommended.
Worked example: Rabbit Cage Size
Let’s say you're buying a cage for a British Lop rabbit, an adult weighing approximately 4.5kg. The calculator suggests a minimum internal volume of 1.2m³ (120 litres). This translates to approximate dimensions of 1.3 meters long x 1.3 meters wide x 1 meter high – roughly the size of a small wardrobe. You'll likely need to factor in the space required for accessories such as bedding, food bowls and toys when considering your overall space requirements.
This figure is a baseline; rabbits are active animals and benefit from additional space. While this calculation provides a starting point, consider purchasing a larger cage or providing access to an outdoor run, especially during warmer months. You can find suitable rabbit cages on Amazon UK ranging from £80 for a basic hutch upwards.
More questions answered
What does ‘active’ and ‘moderate’ mean in the calculator?
‘Active’ refers to pets that spend a lot of time running, jumping, and exploring within their cage, while ‘moderate’ suggests a more relaxed pet with less strenuous activity. This impacts the volume calculations; an active hamster will need more space than a moderately active one.
Can I use this calculator for multiple species?
Yes, you can, but it's important to consider the needs of each individual animal. The calculator provides minimum recommendations – your pet’s specific requirements may vary based on breed, age and activity level.
What if my rabbit is particularly energetic?
Rabbits are naturally active animals. Consider increasing the recommended volume by 20-30% to provide ample space for exercise and play. A larger hutch or a run would be beneficial.
How accurate are these calculations?
These calculations are based on average needs, but individual pets can vary greatly. Monitoring your pet’s behaviour and adjusting the cage size accordingly is crucial.
Do I need to buy the largest cage suggested by the calculator?
Not necessarily. The calculator provides a minimum recommendation. A larger cage offers more space for enrichment activities, but it's better to start with the calculated volume and assess your pet’s needs further.
What bedding should I use in my small pet’s cage?
Suitable bedding includes paper-based bedding (like Carefresh), fleece liners or wood shavings. Avoid cedar or pine shavings as they can be harmful to your pet's respiratory system.
How often should I clean my small pet's cage?
Regular cleaning is essential for maintaining hygiene and preventing health problems. Spot clean daily, removing soiled bedding, and do a full cage clean approximately once a week – depending on the size of your cage and number of pets.
What enrichment items should I provide in my small pet’s cage?
Provide toys such as chewable wooden blocks, tunnels, cardboard boxes and foraging opportunities to keep your pet entertained and stimulated. This helps prevent boredom and promotes mental wellbeing.
Can I use a converted cupboard as a small pet cage?
A converted cupboard can be suitable if it meets the minimum volume requirements calculated by the tool but ensure there are no sharp edges or potential hazards for your pet. Secure all fittings properly.
Where can I buy accessories for my small pet’s cage?
You'll find a wide selection of cages, bedding, toys and food supplies on Amazon UK – check out the ‘Pets > Small Pet Supplies’ category for great deals and options to suit your budget. Don't forget to read customer reviews before making a purchase!