Best Litter Box for Multiple Cats: How Many, Where and Which to Buy

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This page is for homes with two or more cats that are setting up litter boxes, adding a cat, or dealing with a box that fills, smells or gets skipped too fast. It covers how many boxes you need, where they go, what size and style hold up to shared use, and which boxes and supplies from our catalog fit a multi-cat home.

The short answer: plan on one box per cat plus one, spread around the home rather than lined up in one spot. Choose the largest open box that fits each spot, use a hard-clumping litter made for several cats, and scoop at least once a day. There is no single box that replaces having enough of them.

How we chose: picks are based on brand specs, the product listing and public reviews from named outlets linked on each product page. We have not tested these products ourselves.

How to set up litter boxes for multiple cats

How many boxes: one per cat, plus one

This is the rule nearly every cat welfare group gives. International Cat Care recommends one tray per cat plus at least one extra, and the Cornell Feline Health Center, the ASPCA and Humane World for Animals give the same number. So two cats need three boxes and three cats need four. A single large or self-cleaning box does not change the count, because the point is choice and access, not capacity.

Spread them out

Where the boxes go matters as much as how many there are. International Cat Care says trays should be spaced around the house, away from food and water, and not all placed together in one area. Two boxes side by side can work like one big box, and one cat can block both. Humane World for Animals suggests at least one box on each floor of a multi-level home, in quiet, low-traffic spots. The ASPCA adds that cats do not like to feel cornered and want more than one way out, so avoid closets and dead ends where a cat using the box can be trapped by another cat.

Size: bigger than most boxes sold

International Cat Care suggests a tray about one and a half times your cat’s length, measured from the nose to the base of the tail. For an average adult cat that is longer than many boxes labeled large, so measure your biggest cat and buy the largest box that fits the space. Shared boxes also fill faster, and a larger box keeps a clean area open between scoops.

Open, high-sided, covered or top entry

• Open: Cornell says most cats prefer an uncovered box that lets odor escape and gives a full view of the room. In a multi-cat home that view lets a cat see another cat coming, so open boxes are the safest default.
• High-sided open: tall walls catch kicked litter and cats that spray or pee high, while keeping the open top. Check that the entry is low enough for your oldest cat.
• Covered: more privacy and less scatter for you, but Humane World for Animals notes that a hood can trap smells and limit what a cat sees, which makes some cats feel trapped. If one cat ambushes another, a hood with a single exit can make that worse.
• Top entry: very good at keeping dogs out and litter in, but every cat must jump in and climb out. Not a fit for kittens, seniors or cats with stiff joints, so pair it with at least one open box.
• Self-cleaning or self-sifting: cuts scooping in a busy box. International Cat Care warns that movement and noise can startle cats, so introduce one slowly and keep a regular box available.

Litter, depth and scooping

Use the same litter in every box while cats settle in, and pick one that clumps hard so each clump lifts out whole. The ASPCA says most cats prefer clumping, unscented litter, and most cats like about one to two inches of it; Humane World for Animals puts the preference at about 2 inches. With several cats, scoop at least once a day, and twice is better: International Cat Care suggests scooping at least twice daily and fully emptying and washing clumping litter trays every 2 to 4 weeks. Wash with hot water and a mild detergent, since International Cat Care notes that some disinfectants that turn cloudy in water are toxic to cats.

Watch who is using which box

In a multi-cat home it is easy to miss that one cat has stopped using the box. Going outside the box, straining or frequent small trips can be a sign of illness, not just a box problem. The ASPCA lists urinary tract infections, cystitis and bladder stones among the medical causes, so call your vet before you rearrange the boxes.

Our picks for multi-cat homes

IRIS USA High Sided Cat Litter Box with Scatter Shield, Large

The easiest box to buy in multiples. It is an open-top box with tall walls that act as a built-in scatter shield, made in the USA with smooth surfaces for quick wipe-downs (IRIS USA). Cats.com listed it as a budget high-sided pick, noting walls close to 12 inches tall and an interior that resists sticking. It does nothing extra for odor, and Cats.com noted a raised edge along the bottom where wet litter can cling.

Omega Paw Roll ‘n Clean Self Cleaning Litter Box, Large

For a busy box that you would rather sift than scoop. You roll the box onto its top and back, and a grate drops clumps into a pull-out tray; the brand says the Large size is meant for big cats or multi-cat homes (Omega Paw). It needs no electricity. Cats.com called it an affordable way to try self-cleaning, while Reviewed found it runs small. It is covered, so keep at least one open box available too.

Modkat Flip Covered Litter Box, Front Entry, White

For homes where one cat sprays or kicks litter high. The magnetic lid has three positions, including a half flip for scooping, and the box measures 20.5 x 15.75 x 16.8 inches with a reusable liner (Modkat). PetsRadar recommended it for messy cats and high sprayers. It costs much more than a basic pan, and the hood trade-offs above apply, so it works best as one box among several.

IRIS USA Top Entry Cat Litter Box, Large, Beige/White

For multi-cat homes that also have a dog. Cats enter through the top, the grooved lid catches litter from paws, and the shape helps keep dogs out. Cats.com found it good at containing scatter and easy to scoop without removing the lid, but said the opening was too small for their larger senior cat. Pair it with an open box for any cat that cannot jump easily.

Supplies that help with several cats

Dr. Elsey’s Ultra Unscented Clumping Clay Cat Litter, 40 lb

An unscented, hard-clumping clay litter that the brand says is made for multi-cat homes and sifting or mechanical boxes (Dr. Elsey’s). The big bag suits a home filling three or four boxes. Scented alternative: ARM & HAMMER Clump & Seal Platinum Multi-Cat, which adds baking soda to clumping clay (ARM & HAMMER).

DuraScoop Premium Multicat Metal Cat Litter Scoop (Jumbo)

A deep, all-metal scoop that moves more litter per pass, which helps when you scoop several boxes a day. Cats.com named it its best litter scoop overall, while warning that it may be too big and heavy for some people and that small clumps can slip through the slots.

Gorilla Grip Coiled Mesh Cat Litter Mat, 35 x 23 in

A coiled mesh mat with a water-resistant backing that catches litter as cats step out. The brand sells sizes up to a 47 x 35 inch jumbo, handy for two boxes in one room (Gorilla Grip). Cats.com picked it as the best mat for large boxes, though clumps can lodge in the coils.

Mistakes to avoid

• Having fewer boxes than cats plus one.
• Lining up all the boxes in one room or one corner.
• Putting every box in a covered or top-entry style.
• Choosing boxes for the space instead of for your biggest or oldest cat.
• Scooping once a day when several cats share a box that fills by evening.
• Switching litter or box style for all cats at once instead of gradually.

FAQ

How many litter boxes do I need for 2 cats?

Three. International Cat Care, Cornell, the ASPCA and Humane World for Animals all recommend one box per cat plus one extra, placed in different areas.

Can two cats share a litter box?

Some do, but it is not recommended. Sharing a single box raises the risk that one cat avoids it or is blocked from it, which can lead to accidents elsewhere in the home.

What size litter box is best for multiple cats?

Go by your largest cat. International Cat Care suggests a tray about one and a half times the cat’s length from nose to tail base, so for most adult cats choose the biggest box that fits each spot.

Is a self-cleaning litter box good for multiple cats?

It can cut down on scooping, but it still counts as one box. International Cat Care notes that movement and noise can startle cats, so introduce it slowly and keep regular boxes available.

How often should you scoop with multiple cats?

At least once a day, and ideally twice. International Cat Care suggests scooping at least twice daily and fully emptying and washing clumping litter trays every 2 to 4 weeks.

Where should litter boxes go in a multi-cat home?

In different quiet, easy-to-reach spots, away from food and water, with at least one box per floor. Avoid dead ends where one cat can corner another.

For litter types and odor, see the best cat litter for odor control and our cat litter and litter box buying guide, or browse all cat litter and litter boxes.