Litter & Litter Tech
Best Litter Boxes for Large Cats (2026)
A Maine Coon in a standard pan is a cat standing with its back end over the edge. The fix is floor area, and it is easy to check before you buy.
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Everyone in this category says they tested twenty litter boxes. We have not tested any, and we say so. What we do instead: compile the published specs, read the manuals, and do the arithmetic on what this gear costs to run and how it behaves once there is more than one cat using it. Every spec is linked to the document it came from. Prices are checked daily — last verified November 12, 2026. Here is exactly how we pick.
Quick picks
Ranked on the published specs and the arithmetic below. Tap any row to jump to the full write-up. We have not tested these — here is exactly how we pick.
| # | Product | Best for | Score | Price |
|---|---|---|---|---|
| 1 | IRIS USA XX-Large Open Top Litter Box At a published 30 by 20 inches this is the largest open-top pan in general retail, and floor area is the single spec that decides whether two cats will share a box. | The biggest floor area you can buy | 8.7 | |
| 2 |  iPrimio Stainless Steel XL Litter Box, Open Pan A 23.5 by 15.5 inch stainless pan with a nonstick interior -- steel does not scratch the way plastic does, and scratches are where litter box odor lives. | A large cat, and a box that never absorbs odor | 8.2 | |
| 3 |  KittyGoHere Senior Cat Litter Box A published 3 inch entry against the 6 to 8 inches a standard pan asks for, which is the difference between a box an arthritic cat uses and one it gives up on. | A cat that has started missing the box | 8.0 |
#ad Buy links are affiliate links. Prices come from a live daily check; where we have no verified price we say "check price" rather than print a stale one.
Most boxes sold as extra large are large for a box, not for a cat. The difference shows up the first time a big cat has to reverse out because it could not turn around.
The turn-around test
The Ohio State Indoor Pet Initiative sets the standard plainly: the box should be large enough for the cat to stand on all fours and turn around in. That is a measurement, not an opinion, and it is easy to take. Measure your cat from nose to the base of the tail while it is standing.
IRIS XX-Large Open Top: 30 x 20 = 600 square inches, with a 14 inch wall and a scatter shield.
KittyGoHere Senior, large: 24 x 20 = 480 square inches, with a 3 inch entry cut into a 5 inch wall.
iPrimio Stainless XL: 23.5 x 15.5 = 364 square inches.
Frisco High-Sided XL: 24 x 18 externally, but Frisco publishes the internal floor at 19.75 x 12.875 = 254 square inches -- barely 59 percent of the outside measurement, which is why internal figures matter.
What the three publish
| Product | External floor | Wall or entry | Material |
|---|---|---|---|
| IRIS USA XX-Large Open Top | 30" x 20" | 14" with scatter shield | Plastic |
| iPrimio Stainless XL | 23.5" x 15.5" | 6" open pan | Stainless steel |
| KittyGoHere Senior, large | 24" x 20" | 5" wall with a 3" entry | Plastic |
Manufacturers' and retailers' published figures. None of the three publishes an internal floor area.
The picks
The IRIS XX-Large wins on the figure that decides the category. At 600 square inches it gives a large cat room to turn, and the scatter shield catches the litter a big cat kicks. The 14 inch wall is its own trade: excellent containment, a real climb for an older cat.
The iPrimio Stainless XL is the smallest floor here and the best surface. Steel does not develop the fine scratches that hold odor in a plastic pan, and its nonstick interior means waste lifts rather than needing scrubbing. The trade is the wall: iPrimio's detachable enclosure is no longer listed, so this is a flat 6 inch open pan and a high sprayer is not contained. Our stainless steel page covers that argument in full.
The KittyGoHere large box is the one to buy when a large cat is also an old cat. It publishes 24 by 20 inches — 480 square inches, more floor than the iPrimio and behind only the IRIS here — with a 3 inch entry, which is the lowest step in this hub. Our senior box page explains why that single figure matters more than anything else for a stiff cat.
Size does not replace count
A bigger box is not a substitute for enough boxes. The n+1 rule still applies, and our box count page covers where the rule comes from. In a house with several large cats, two big boxes in different rooms beat one enormous one in a corner.
- Two large cats: three boxes, at least two of them at 500 square inches or more.
- A large cat and a small one: size for the big cat. The small cat can use a large box; the reverse is not true.
- A large cat with stiff joints: low entry first, floor area second.
Litter depth and weight
- Two inches of litter, no more. The Indoor Pet Initiative’s guidance does not change because the box is bigger.
- A big box needs more litter to reach that depth. 600 square inches at two inches deep is a lot more litter per change than a 254 square inch box.
- Full boxes get heavy. Check you can lift and tip it before buying the largest option.
- Use a mat. A big cat scatters more litter; our mat roundup sizes the mat to the box.
The picks in full
Specs are the manufacturer's own, linked to the page they came from. Prices come from a live daily check; where we have no verified price we say so rather than print a stale one.
IRIS USA XX-Large Open Top Litter Box
IRIS USA · Litter box · Our score 8.7/10
#ad Price as of November 12, 2026. Prices move; we check daily. How we're funded.
At a published 30 by 20 inches this is the largest open-top pan in general retail, and floor area is the single spec that decides whether two cats will share a box.
Published specs
| External dimensions | 30" L x 20" W x 14" H (published) |
|---|---|
| Entrance | 6.5" curved entrance in the scatter shield |
| Type | Open top with scatter shield |
| Litter type | Any |
| Weight, empty | 4.4 lb |
| Weight capacity | Not published |
| Warranty | None published |
30 x 20 = 600 sq inches of external footprint. Two cats sharing it get 300 sq inches each -- still more than a whole standard jumbo pan gives one cat. That is why one very large box beats two small ones when floor space is tight.
What the specs favor
- Largest published open-top footprint here at 30 x 20 inches
- 14-inch walls with a scatter shield -- the combination that stops high sprayers
- Publishes a 6.5 inch curved entrance, so the climb is a figure rather than a guess
- Open top, the configuration cats are documented to prefer
- Takes any litter, no proprietary anything
What they don't
- 600 square inches of floor is a lot of floor to give up
- IRIS does not publish a weight capacity
- 14-inch walls make it a genuine step up for a senior cat
- No warranty published at all
Your cat is elderly or arthritic. A 14-inch wall with a 6.5-inch entrance is a real climb, and a cat that starts avoiding the box because getting in hurts is a much worse problem than litter scatter.
How it scores
Scores are our editorial weighting of the published specs above, not a test result. They are deliberately kept out of this page's structured data.
iPrimio Stainless Steel XL Litter Box, Open Pan
iPrimio · Stainless steel litter box · Our score 8.2/10
#ad Price as of November 12, 2026. Prices move; we check daily. How we're funded.
A 23.5 by 15.5 inch stainless pan with a nonstick interior -- steel does not scratch the way plastic does, and scratches are where litter box odor lives.
Published specs
| Footprint | 23.5" x 15.5" |
|---|---|
| Height | 6" (open pan; no enclosure on this listing) |
| Interior | Nonstick surface with rounded corners |
| Material | Stainless steel |
| Maker's claim | Never absorbs odor, rust or stains like plastic |
| Weight, empty | 4.01 lb |
| Interior floor | Not published |
| Warranty | None published |
23.5 x 15.5 = 364 square inches, slightly LESS than the plain open jumbo pan we list elsewhere at 22.4 x 16.9 = 379. So you are not buying more room -- you are buying a surface that stays smooth. Plastic pans pick up fine scratches from scooping, and those scratches hold urine residue that washing does not reach.
What the specs favor
- Stainless steel does not develop the scratches that trap odor in plastic
- Nonstick interior with rounded corners, so waste lifts rather than needing scrubbing
- Big enough footprint for a large cat
- Will not crack or go brittle with age
What they don't
- Open pan only -- iPrimio's detachable enclosure is no longer listed, so a high sprayer is not contained
- No interior floor figure published
- Steel is loud when litter is poured or a cat digs hard
- More expensive than plastic for the same floor area
- No warranty published
Your cat sprays high. A flat 6 inch wall is all this pan has now that the enclosure variant has gone, and a high-sided box is the one that contains it.
How it scores
Scores are our editorial weighting of the published specs above, not a test result. They are deliberately kept out of this page's structured data.
KittyGoHere Senior Cat Litter Box
KittyGoHere · Low-entry litter box · Our score 8.0/10
#ad Price as of November 12, 2026. Prices move; we check daily. How we're funded.
A published 3 inch entry against the 6 to 8 inches a standard pan asks for, which is the difference between a box an arthritic cat uses and one it gives up on.
Published specs
| Large | 24" x 20" x 5", cats up to 20 lb |
|---|---|
| Small | 20" x 15" x 5", cats up to 6 lb |
| Jumbo | Sold, but no dimensions published in our sources |
| Entry height | 3" |
| Form | Open top, low cut-down entrance |
| Made in | USA |
A standard high-sided pan asks a cat to lift a hind leg 6 to 8 inches. This publishes 3. For a cat with stiff hips that is not a comfort improvement, it is the difference between clearing the wall and standing in the doorway to go.
What the specs favor
- Publishes an entry height, which almost no litter box does
- Large size gives 480 square inches of floor, more than most covered boxes
- Open top, so no door, no hood and no single choke point
- Three published sizes with cat-weight guidance on two of them
What they don't
- Low walls mean a high-spraying cat will go over them
- Open design contains no odor at all
- Litter scatters more than from a high-sided pan
Your cat sprays upward or digs enthusiastically. Five inches of wall is not enough, and the answer for that cat is the opposite box.
How it scores
Scores are our editorial weighting of the published specs above, not a test result. They are deliberately kept out of this page's structured data.
Common questions
What size litter box does a large cat need?
Is the IRIS XX-Large big enough for a Maine Coon?
Do large cats need high sides?
Can I just use a storage tub for a big cat?
Is a covered box a bad idea for a large cat?
Sources
- Amazon listing -- IRIS USA XX-Large High Sided Cat Litter Box, Scatter Shield, Navy, model 588434 (published 30" L x 20" W x 14" H, XXL open top, tall 14 in walls with a 6.5 in curved entrance, smooth interior with minimal crevices, stated for large breeds and multi-cat households, 4.4 lb; no weight capacity and no warranty published)
- Amazon listing -- iPrimio Stainless Steel Cat Litter Box, Nonstick, XL 23.5" x 15.5" Open Pan (extra large open steel pan stated as built for big cats, smooth nonstick interior with rounded corners stated to rinse clean without scrubbing, published 23.5 x 15.5 x 6 in, 4.01 lb, maker states steel never absorbs odor, rust or stains like plastic; no interior floor figure and no warranty published)
- KittyGoHere -- Senior Cat Litter Box retail listing, large size in Misty Gray (large 24 x 20 x 5 in for cats up to 20 lb, 3 in entry, made in USA). Repointed 2026-10-10: the previously cited Beach Sand listing went "Currently unavailable".
- Chewy -- Frisco High-Sided Cat Litter Box XL 24-in listing
- Ohio State University Indoor Pet Initiative -- Litter Boxes
Read next
- Best Litter Boxes for Multiple Cats (2026)
Four boxes compared on interior floor area, wall height and what each one actually solves. Cheap pans beat clever ones more often than you would expect.
- Best High Sided Litter Boxes (2026)
High-sided boxes compared on published wall height and floor, and how to tell a spraying problem from a digging one.
- Best Automatic Litter Boxes for Large Cats (2026)
Automatic boxes filtered on published weight range and entryway size for Maine Coons, Ragdolls and other large breeds.
- Best Stainless Steel Litter Boxes (2026)
Stainless steel litter boxes compared against a plastic benchmark on floor area, wall height and what the material actually buys.
- Best Litter Boxes for Senior Cats (2026)
Litter boxes ranked on published entry height for arthritic and older cats, with the step arithmetic worked through.