How often to change cat litter
Scoop solid waste out daily, and do a full change of the litter roughly once a week if you use a clumping litter, more often for a non-clumping type — though the right frequency for your household depends on how many cats you have, how many trays, and what kind of litter you use. Smell and appearance are the most reliable everyday signals, more so than any fixed schedule.
Daily scooping is the foundation
Scooping out solid waste and any clumped urine once or, ideally, twice a day keeps a tray usable between full changes and is the single biggest factor in how long a full change can reasonably wait. A tray that is scooped daily needs a complete change far less often than one left to build up.
This daily habit also gives you a good early warning system for your cat's health — changes in the frequency, size or appearance of what you are scooping out are often the first thing an owner notices before anything else seems different.
How often for a full change
For clumping litter with daily scooping, a full change and clean of the tray roughly once a week is a reasonable general starting point, adjusted up or down based on odour and how quickly the litter looks used up. Non-clumping litter tends to need a full change more often, commonly every two to three days, since it does not isolate waste the same way.
The number of cats sharing a tray matters enormously here. The widely cited welfare guidance is one litter tray per cat, plus one extra, and a household running fewer trays than that will need more frequent full changes to keep any single tray usable.
The signals that matter more than a schedule
A strong ammonia smell is the clearest sign a tray needs attention sooner rather than later, and it is worth trusting your nose over a fixed calendar reminder. Litter that no longer clumps properly, or a tray that looks visibly full despite regular scooping, is another practical cue.
If your cat suddenly starts avoiding the tray, urinating just outside it, or seems to be straining, that is worth mentioning to a vet rather than assuming it is purely a cleanliness issue — a sudden change in toileting behaviour can have a medical cause that a cleaner tray will not fix on its own.
What we use
Things we stock that owners commonly reach for here. Nothing on this page depends on you buying one.
Leucillin Antiseptic Skincare Spray for Cats & Dogs
A versatile, alcohol-free antiseptic spray that cleans, soothes, and helps protect your pet's skin from bacteria, viruses, and fungi.
From£16.49
Pressure-Activated Pet Cooling Mat
Press down, feel the cool — this pressure-activated mat absorbs body heat and stays up to 10°C cooler than the room, with no freezing required.
From£34.99
Absorbent Cotton Gauze Swabs for Pets – Pack of 100
Highly absorbent, low-lint cotton gauze swabs produced in clean conditions — a practical first-aid essential available in three size and ply combinations.
From£4.49
App-Controlled Self-Cleaning Cat Litter Box
A smart self-cleaning litter box that scoops waste automatically and bags it contactlessly, so you never face the mess. The companion app records toilet use and weight, and sends full-box, low-litter and cleaning reminders.
£399.99
Common questions
- How many litter trays should I have for multiple cats?
- A commonly cited rule of thumb is one tray per cat, plus one extra, so two cats would ideally have three trays available. Having enough trays reduces how often each one needs a full change and helps avoid one cat guarding access to a shared tray.
- Is clumping or non-clumping litter easier to maintain?
- Clumping litter generally allows for less frequent full changes because daily scooping removes waste along with the litter clumped around it, leaving more of the tray usable. Non-clumping litter tends to need a full change more often since waste is not isolated in the same way.
- Why does my cat's litter tray smell even though I scoop daily?
- A lingering smell despite regular scooping usually means the tray is due a full change and clean, since odour builds up in the litter and the tray itself over time even with good daily maintenance. Washing the tray properly during a full change, not just replacing the litter, helps with this too.
- My cat has stopped using the litter tray — is that just about cleanliness?
- It can be, but a sudden change in toileting behaviour is also a recognised sign of some medical issues, so it is worth mentioning to a vet rather than assuming a dirtier tray is automatically the cause. Ruling out a medical reason first makes any behavioural fix more likely to work.
- Does litter tray location affect how often it needs changing?
- Not directly, but a tray tucked away somewhere you rarely pass is easy to forget to check, which can quietly stretch out the real gap between changes. Placing trays somewhere you naturally walk past daily makes it easier to judge by smell and appearance rather than relying on memory alone to keep track of it.
Related
Sources
Written against guidance published by UK veterinary and welfare organisations. Always confirm specifics with your own vet.
Written by Matt Garnett, who runs Giddy Pets and is a lifelong pet owner — not a vet. This is general information, not veterinary advice, and it cannot replace an examination by the vet who knows your animal. How we write these guides.