Litter box size matcher
Tell us how many cats and how heavy the largest one is. We size the box from published entry widths and weight ratings and list the models in our coverage that fit.
Your inputs
All cats in the household that will use this box.
Weight bands follow the ranges manufacturers publish for their boxes.
Results update as you type. This runs in your browser — nothing is sent or stored.
Result
Recommended size tier: Compact
A smaller entry and footprint suits a single small cat; expect to empty the waste drawer more often in a multi-cat home.
Minimum entry width to look for: 12 in
Cat size band: 10–15 lbs
Household size: 2 cats
Litter RobotsLitter-Robot 4
Rated for up to four cats and cats from 3 to 25 lbs — the widest published multi-cat envelope in its category
Editor score: 8.4 / 10
Price: check current price
Litter RobotsPETLIBRO Luma Smart Litter Box
Rated for up to ten cats — the highest cat count in this group
Editor score: 8.5 / 10
Price: check current price
Worked examples (check the math)
Two medium cats (10–15 lbs)
| How many cats share the box? | 2 cats |
|---|---|
| Heaviest cat | 10–15 lbs |
| Recommended size tier | Compact |
|---|---|
| Outputs | A smaller entry and footprint suits a single small cat; expect to empty the waste drawer more often in a multi-cat home. |
| Minimum entry width to look for | 12 in |
| Cat size band | 10–15 lbs |
| Household size | 2 cats |
Four cats, largest 18 lbs
| How many cats share the box? | 4 cats |
|---|---|
| Heaviest cat | 15–22 lbs |
| Recommended size tier | Standard |
|---|---|
| Outputs | Fits most adult cats and typical multi-cat households; check the rated capacity against your cat count. |
| Minimum entry width to look for | 15 in |
| Cat size band | 15–22 lbs |
| Household size | 4 cats |
One small cat (under 10 lbs)
| How many cats share the box? | 1 cats |
|---|---|
| Heaviest cat | Under 10 lbs |
| Recommended size tier | Compact |
|---|---|
| Outputs | A smaller entry and footprint suits a single small cat; expect to empty the waste drawer more often in a multi-cat home. |
| Minimum entry width to look for | 10 in |
| Cat size band | Under 10 lbs |
| Household size | 1 cats |
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