How Often Should You Change Cat Litter?
Scoop at least daily and fully change litter anywhere from weekly to every 4 weeks depending on type. See a schedule, multi-cat tips and safe box cleaning.
By Best Pet Supplies Guide
Updated November 2, 2026
Scoop the litter box at least once a day, and plan on a full litter change somewhere between weekly and every 4 weeks, depending on the litter type. Sources do not agree on one number. iCatCare suggests emptying and washing the box weekly for non-clumping litter and every 2 to 4 weeks for clumping litter, and VCA Animal Hospitals gives the same 2 to 4 week range for clumping litter that is scooped daily.
This guide gives you a quick schedule, then explains how to adjust it for your litter, your number of cats and the way you clean the box.
Quick Schedule
Use this table as a starting range. Pet-care organizations give slightly different numbers, so start in the middle and adjust based on how the box smells and looks.
| Task | Clumping litter | Non-clumping (clay) litter |
|---|---|---|
| Scoop waste | At least once a day (iCatCare suggests twice a day) | At least once a day (iCatCare suggests twice a day) |
| Full litter change | Every 2 to 4 weeks (iCatCare, VCA); Humane World says 2 to 3 weeks if you scoop daily | About weekly (iCatCare); Humane World says about twice a week for clay litter |
| Wash the box | Each time you empty it; the ASPCA suggests weekly | Each time you empty it; the ASPCA suggests weekly |
| Multiple cats | Lean toward the shorter end of the range | Lean toward the shorter end of the range |
Scooping
The ASPCA advises scooping at least once a day. It also suggests washing the box weekly and replacing all of the litter at that time. As mentioned above, iCatCare goes further and recommends scooping at least twice a day.
A simple routine is to scoop in the morning and again in the evening. Keep a lidded waste bin and a scoop next to the box so the job takes a minute. After scooping, add fresh litter to replace what you removed so the box stays at a consistent depth.
Scooping is not a replacement for a full change. Even when you remove clumps and waste every day, urine odor and fine residue build up in the remaining litter over time. That is why the schedule above includes both tasks.
Full Litter Changes by Type
A full change means dumping all of the litter, washing the box, drying it and refilling with fresh litter. Clumping litter forms hard balls around urine, so daily scooping removes most of the soiled material. That is why VCA and iCatCare allow 2 to 4 weeks between complete changes, and Humane World gives a slightly tighter 2 to 3 weeks if you scoop daily.
Non-clumping litter does not form removable clumps, so urine soaks into the whole layer. iCatCare recommends emptying and washing the box weekly for this type. Humane World says clay litter needs changing about twice a week.
If your box smells even though you scoop daily, change the litter sooner. If you are not sure which type you have or which one suits your cat, browse our litter and litter box guides to compare options.
Multiple Cats
The ASPCA recommends one litter box per cat plus one extra, so two cats need three boxes. iCatCare also advises placing the boxes apart from each other rather than lined up in one spot. Separate locations give each cat a choice and make it harder for one cat to guard every box.
There is no single official schedule for multi-cat homes. More cats means more waste going into the same litter, so expect to sit at the shorter end of the ranges above. For example, with two cats and clumping litter, you might scoop twice a day and plan full changes closer to 2 weeks than 4.
Spreading the use across three boxes helps, because each box gets fewer visits. Still, check every box daily. If one box gets noticeably more use, change that one more often. An automatic box can count as one of those boxes; see self-cleaning litter boxes for multiple cats for what to check.
Cleaning the Box Safely
Wash the empty box with warm water and a mild, unscented soap. The ASPCA mentions unscented soap or baking soda for the weekly wash. Rinse well and dry the box completely before adding fresh litter.
Skip strong cleaners and disinfectants. iCatCare warns that some disinfectants, including products containing chloroxylenol such as Dettol, are toxic to cats. Humane World advises avoiding ammonia and citrus-based products around the litter box.
If urine ends up on the floor or a rug rather than in the box, that is a separate cleanup job. Our cleaning and odor control guides cover products for stains outside the box. If you want help choosing a cleaner for your cat’s box, ask your veterinarian which products are appropriate. Our guide to enzyme cleaners for pet urine explains how to treat those spots.
When to Replace the Box
Washing does not always remove odor from an older box. VCA notes that old litter boxes can hold on to smells and are worth replacing. If a box still smells after a thorough wash and full dry, it is time for a new one.
When you swap in a new box, keep it in the same spot at first. Changing the location and the box at the same time adds two variables for your cat to adjust to.
Changes Worth Watching
Pay attention to how your cat uses the box when you scoop. Straining, going to the box much more often than usual, or blood in the urine can be signs that need attention. According to the Cornell Feline Health Center, straining without producing urine is an emergency, especially in male cats.
Do not try to work out the cause yourself. If your cat’s bathroom habits change, talk to your veterinarian.
Frequently Asked Questions
How often should I scoop the litter box?
At least once a day, according to the ASPCA. iCatCare suggests scooping at least twice a day, so twice daily is a good target if your schedule allows.
How often should I completely change the litter with 2 cats?
There is no one official two-cat schedule. A practical approach is to use the shorter end of the range for your litter type, such as about 2 weeks for clumping litter or weekly or more often for non-clumping litter, and change sooner if the box smells.
Can I go 4 weeks between changes with clumping litter?
iCatCare and VCA both give 2 to 4 weeks for clumping litter that is scooped daily. Humane World says 2 to 3 weeks. The longer end of the range makes the most sense with one cat and consistent daily scooping.
How many litter boxes do two cats need?
The ASPCA recommends one box per cat plus one extra, so three boxes for two cats. iCatCare advises placing them apart from each other.
What should I use to wash the litter box?
Use warm water and a mild, unscented soap, and dry the box fully. Avoid ammonia, citrus-based products and disinfectants containing chloroxylenol, which iCatCare says are toxic to cats. Ask your veterinarian if you are unsure about a product.
Sources
- ASPCA: Litter Box Problems
- iCatCare: Choosing a litter tray for your cat
- Humane World: How to Litter Train a Kitten or Cat
- VCA Animal Hospitals: Cat Behavior Problems, House Soiling
- Cornell Feline Health Center: Feline Lower Urinary Tract Disease
About the author
Best Pet Supplies Guide publishes research-based buying guides, size guides and care how-tos for dog, cat and pet home supplies, using manufacturer specifications and guidance from reputable pet-care organizations.