How big should a litter box enclosure be for a 15 lb cat?
Start with the pan, not the cabinet
A big cat needs a big pan first. The usual guideline is a pan about 1.5 times the cat's length from nose to base of tail. Large cats are often 18 in or longer, which is why owners of 15 lb cats end up with jumbo pans or storage totes. Then add 2 in on each side for the cabinet interior.
| Cat | Pan (L x W) | Minimum interior | Enclosure width to shop |
|---|---|---|---|
| Up to 10 lb | 16-18 x 12-14 in | 20 x 16 in | 19-24 in |
| 10-13 lb | 20-22 x 16 in | 24 x 18 in | 30-35 in |
| 15 lb and up | 23-25 x 18-19 in | 27 x 21 in | 35-40 in, or a 47 in double |
| Any cat, automatic box | 24-28 x 20-24 in, 18-25 in tall | 30 x 24 in | 39 in or wider, with a door the unit fits through |
The three measurements listings hide
- Interior, not exterior. Panels and a divider take 1-2 in off each dimension. A cabinet listed at 31.5 in wide is often about 29 in inside.
- The doorway. Many cabinets have a 7.5 x 8.5 in opening, which suits a cat of about 10 lb. A 15 lb cat wants about 9 x 10 in, or an open archway.
- Height inside. A hooded pan is usually 17-19 in tall, and a large cat also needs headroom to stand. If the listing gives no inside height, subtract about 2 in from the outside height and any shelf above the box.
Depth: where the cabinet meets your room
A jumbo pan is 18-19 in wide, so the cabinet has to be about 21-22 in deep. That is deeper than a typical console table (12-16 in) and closer to a dresser. Measure the walkway in front of it: leave about 30 in clear so the cabinet door, or the pan when you pull it out to scoop, has room to open.
What the sizes cost in 2026
Price bands from Amazon listings with 10 or more reviews, checked in September 2026:
- 23-31.5 in single-box cabinets: $39-90
- 35-37 in cabinets: $100-115
- 47 in double cabinets: $117-150
- LED and storage cabinets: $129.99-184.99
Going from a nightstand size to a cabinet that truly fits a 15 lb cat usually costs $30-60 more. It is cheaper than replacing a cabinet the cat refuses to enter.
Our picks
- The Lantern House - 47.2 x 22 x 27.7 in cabinet, holds one or two boxes including automatic models, the size we would choose for a 15 lb cat, $173.99
- The Side Table - 18.9 x 20.9 x 24.8 in side-table cabinet for a standard pan and a cat of about 10 lb or under, $67.99
