Cat Litter Box Calculator
Estimate how many litter boxes your home needs and the minimum side height that helps keep litter inside.
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Recommended litter box plan
This is a planning estimate. Add another box if a cat is shy, elderly, or tends to guard a box.
Total litter boxes 3
Placement checklist
- Keep at least one box on every floor cats can access.
- Add one extra box beyond the number of cats.
- Use a lower entry and wider opening for older cats.
How the recommendation is built
- Start with the one-per-cat-plus-one rule.
- Make sure every accessible floor has a box.
- Increase side height slightly for multi-floor homes so litter stays inside better.
Frequently Asked Questions
Why do I need one extra box?
The extra box reduces competition and helps shy cats avoid waiting. It also gives you a backup when one box needs immediate cleaning.
Do I need a box on every floor?
If cats regularly use multiple floors, one box per floor is the safest rule. It keeps the closest option available and reduces accidents.
Does a covered box count the same?
Yes for counting purposes, but covered boxes can feel tighter. Make sure the cat still has enough room to enter, turn, and exit comfortably.
How tall should the box sides be?
A side height around 12 to 18 cm is a practical starting range for most households. Larger or messier cats may benefit from the upper end of that range.
This site provides estimates and planning tools only. It does not replace veterinary advice, diagnosis, or treatment.