Litter Box Calculator
Set your cat count and floors to see how many litter boxes your home needs, how to spread them out, and what size to buy.
| Cats | Boxes |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 4 |
| 4 | 5 |
The one per cat plus one rule
The common guideline is one litter box for each cat, plus one more. That gives every cat a clean choice and lowers the odds that one cat guards a box or starts going outside it. Two cats do well with three boxes. If your home is large or spread out, add another so no cat has to cross the whole house.
Placement matters as much as count
Put boxes in quiet spots with an escape route, not next to a washer, furnace, or a noisy hallway. In a multi-floor home, at least one box on each floor saves a cat from racing down the stairs. Avoid lining every box up in one room, since a single cat can still claim the whole row.
Size, litter, and cleaning
Most adult cats want a box about one and a half times their body length, which lands around 18 to 24 inches for a typical cat. Big cats and long cats need the longer end, and a high-sided or enclosed box cuts scatter. Scoop daily, do a full litter change on a regular schedule, and skip strong scents that put cats off.
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Questions about this calculator
How many litter boxes should I have for two cats?
Two cats do best with three boxes under the one per cat plus one rule. Spread them around the home instead of clustering them in one room. If you cannot fit three, place two in separate quiet spots and scoop them more often.
How many litter boxes does one cat need?
One cat should have at least two boxes. The extra box gives a clean option if one is soiled and helps if your cat starts avoiding a spot. In a single-level home, two boxes in different rooms is the usual setup.
Do you need a litter box on every floor?
Yes, at least one per floor in a multi-level home. Cats can develop aversions when a box is too far away, and a long trip up or down stairs is a common reason for accidents. A small upstairs box is better than none.
Does an automatic litter box count as one box?
It counts as one box, but some cats still want a manual pan as a backup. Automatic boxes also have weight minimums, so young kittens need a separate low-sided box until they clear that threshold. Do not reduce the total count just because one box self-cleans.
How big should a litter box be?
Look for a box about one and a half times your cat length, which is usually 18 to 24 inches for an adult. A covered box should be large enough that the cat can stand and turn without ducking. When in doubt, choose the bigger pan.
Can two cats share one litter box?
They can, but it often leads to stress, guarding, or accidents. Cats are territorial about bathroom spots, so sharing a single box raises the risk that one cat stops using it. Add a second and third box in separate locations instead.
Where should I put litter boxes?
Choose quiet, low-traffic spots with more than one way out, away from food and water. Avoid putting boxes next to loud appliances or in a dead-end corner. If a cat is avoiding a box, try moving it before assuming the cat is the problem.