The short answer
A good rule is a box about 1.5 times your cat's length (nose to tail base), and one box per cat plus one. Most commercial boxes are smaller than that, so big cats often do better with an extra-large or storage-tote-size box. High sides suit diggers and cats that pee high; low entries suit kittens and seniors.
Large boxes we cover
| Box | Longest side | Height |
|---|---|---|
| IRIS USA XX-Large Side-Entry Litter Box 500493 | 30 in | 14 in |
| Eosarcu XL Enclosed Stainless Litter Box | 23.62 in | 15.74 in |
| FUTAM Deep Stainless Litter Box 23.6 in | 23.6 in | 6 in |
| AIPERRO XL Enclosed Stainless Litter Box | 23 in | 11 in |
| Qiuma Low-Entry Stainless Litter Box | 17.5 in | 5.9 in |
Stainless or plastic
Plastic scratches with scooping, and urine smell settles into the grooves. Stainless steel stays smooth, so it stays fresher for years, at a higher price. AIPERRO XL and FUTAM are popular steel options.
Entry height
- Seniors and arthritic cats: a low entry, such as Qiuma.
- Diggers and high peers: high sides or a hood.
- Kittens: low sides at first, then size up.
Covered or open
Covers contain scatter and add privacy but hold smell in, so scoop daily. Some cats refuse hoods; offer an open box if yours hesitates.
SafetyA cat that suddenly avoids its box may be unwell; see your vet.
Products mentioned
Questions readers ask
How many litter boxes do I need?
One per cat plus one, in different spots.
Is a stainless steel litter box better?
It doesn't scratch or hold odor like plastic, so it stays fresher longer.