How Big Should a Litter Box Be for a Large Cat?
If you've ever watched a large cat squeeze into a standard litter box, you already know something isn’t quite right.
Size matters more than most cat owners realise, especially when it comes to cat litter trays designed for larger breeds. For a large cat, a litter box should be at least 1.5 times the length of the cat from nose to tail base. In practical terms, that translates to an internal floor space of 60–75 cm in length and 45–55 cm in width.
For breeds like Maine Coons or Ragdolls — typically measuring 40–50 cm in body length — this is not simply about comfort. Litter box size directly affects whether the cat will use the box consistently or begin to avoid it altogether.
Standard cat litter trays sold in most Australian pet stores measure around 45-50 cm
in length,That size may be adequate for an average-sized cat, but it is often too
cramped for larger breeds- which is why we put our extra large cat litter boxes into a separate selection.
The Size Formula Explained
The 1.5x rule is widely referenced by veterinary behaviourists and comes from research into natural feline elimination behaviour. Cats need enough room to enter the box, turn a full circle, dig, eliminate, and cover — without their body pressing against the sides or their face hovering over soiled litter.
The formula is straightforward: minimum tray length = cat's nose-to-tail-base measurement × 1.5. A Maine Coon with a 48 cm body needs a tray at least 72 cm long. A Ragdoll at 44 cm body length needs at least 66 cm. These are minimums — going slightly larger causes no problems.
Width is equally important but less often discussed. A tray that is long but narrow still forces a large cat to stand sideways when turning. Aim for a width of at least 40–50 cm for most large breeds, or roughly 1.2 times the cat's shoulder-to-shoulder measurement.
Standard vs Extra Large: Size at a Glance
The difference between a standard tray and an extra large cat litter box becomes clear when you compare the dimensions side by side.
The cat litter box size chart below makes it easier to see the difference.
|
Category |
Standard Tray |
Large Cat Litter Tray |
Extra Large Cat Litter Box |
|
Typical Length |
45–50 cm |
55–65 cm |
65–75+ cm |
|
Typical Width |
35–38 cm |
40–45 cm |
45–55 cm |
|
Best For |
Cats under 4 kg |
Cats 4–6 kg |
Cats 6 kg+ / large breeds |
|
Maine Coon / Ragdoll |
Too small |
Borderline |
Recommended ✓ |
Why Space Affects Behaviour, Not Just Comfort
Cats are instinctively cautious when eliminating. A box that is too small triggers a stress response — the cat cannot complete its natural turning and digging routine, and over time it begins to associate the box with discomfort.
A 2025 study published in the Journal of Veterinary Medical Science found that house-soiling is the most common problem faced by cat owners and is the main reason for owners surrendering cats to animal shelters.The same research found that cats showed a clear preference for litter boxes measuring 50 cm or more PETROOM — a threshold that most standard trays on the market still fall short of, and one that becomes even more critical when the cat in question is a large breed.
Turning space is especially critical. A cat that cannot complete a full 360-degree turn inside the box will either eliminate facing the wrong direction — often sending litter over the side — or exit and find somewhere else. High-sided cat litter trays help contain scatter, but do not resolve the problem if the internal floor area is insufficient.
Chronic discomfort from a cramped box can also compound over time. Cats under persistent low-level stress are more prone to urinary issues, and an undersized litter environment is one of the easiest environmental stressors to fix.
Large Breed Considerations: Maine Coon and Ragdoll
Maine Coons are the largest domestic cat breed, with adult males commonly reaching
6-9 kg and body lengths of 45-50 cm. Large breeds also need proportional setups elsewhere — cat trees built for larger cats are another part of the environment most owners get wrong on the first attempt.
Applying the 1.5x formula: a Maine Coon at 48 cm body length needs a minimum tray length of 72 cm; a Ragdoll at 44 cm needs at least 66 cm. The Makesure Cat Litter Box MAX, available through Petroom, measures 67.7 cm in length and 49 cm in width — one of the few extra large cat litter box options on the Australian market that genuinely meets the space requirements for these breeds.
If you have a large-breed kitten, size up early. Kittens benefit from a litter tray for kittens during the first few months, but large breeds outgrow standard sizes by around 6–8 months. Introducing a larger box before they develop a firm size preference makes the transition easier.
Open Top, High Sides, or Top Entry — What Works Best?
Design matters alongside size. A high sided cat litter tray is a practical starting point for most large cats — the raised walls contain scatter without restricting entry or exit, and the majority of large cats can step in comfortably. Walls of 20–25 cm on three sides with a lower front panel strike a good balance between containment and accessibility.
A top entry cat litter box can work well for agile large cats and virtually eliminates scatter. However, for senior cats or those with hip or joint issues — not uncommon in larger breeds — the jumping motion can cause discomfort. If you choose a top entry design, confirm the internal floor area still meets the 60–75 cm length guideline.
Fully enclosed designs with front-entry flaps offer privacy and odour control but often run smaller internally. Always check the internal floor dimensions, not the external housing measurement, before purchasing.
Practical Sizing Tips for Australian Cat Owners
When shopping for cat litter trays in Australia, product listings often display external
dimensions. For enclosed or hooded designs - like our All-in-One Storage cabinet — subtract 5-8 cm from each measurement to estimate the usable internal space.
The standard rule of one tray per cat plus one extra still applies regardless of tray size. For a two-cat household — especially with large breeds — three large cat litter trays, each meeting the 60+ cm length guideline, is the appropriate setup. Placing them in different rooms reduces competition and stress.
Litter depth also matters for large cats. A depth of 5–7 cm gives enough material to dig without creating excess tracking. Tofu-based cat litter clumps firmly, is lighter to handle in larger volumes, and works well in oversized trays — making daily maintenance more manageable when the box itself is heavy.
Getting the Full Environment Right
Litter box size is one part of a broader environmental setup for large cats. Vertical space is equally important — Maine Coons and Ragdolls are natural climbers, and a sturdy cat tree for large cats gives them an appropriate outlet for that energy. Together, a correctly sized litter setup and adequate vertical space address the two most common environmental causes of stress-related behaviour in large domestic cats.
At Petroom, we stock a range of cat litter trays sized for large and extra-large cats, including options that meet the 60–75 cm length range recommended for Maine Coons, Ragdolls, and other big breeds. Browse our range online or get in touch if you need help choosing the right fit based on your cat's measurements.
