How Often Should You Change Cat Litter? Scoop Daily, Full Change Weekly

The short answer: scoop the litter box at least once a day, and empty it completely, wash the box and refill it with fresh litter about once a week. That's the ASPCA's guidance for a typical household (ASPCA). With more than one cat, or with non-clumping litter, the full change needs to happen more often, sometimes every few days.

Most "how often" questions come down to two jobs with very different rhythms: the daily scoop and the full change. Here's how often each one needs doing, why it matters more than people think, and how to stop either one from slipping.

The two jobs: scoop and full change

Scooping means removing the poo and the urine clumps. Cornell's Feline Health Center says that if you use clumping litter, you should "remove feces and clumps daily and add clean litter as needed" (Cornell Feline Health Center). Purina's UK guidance goes further: take poo out "at least twice a day" if you can't do it straight away, and urine at least once a day (Purina UK).

A full change means tipping out all the litter, washing the box and refilling it. Scooping never gets everything: small bits of urine and waste stay in the litter and build up over time. That's why the smell eventually comes back even in a box that's scooped every day.

How often to change cat litter: by litter type and number of cats

Situation	Scoop	Full change and wash
One cat, clumping litter	At least daily	About once a week
Two or more cats, clumping litter	At least twice a day	Every 3 to 5 days
One cat, non-clumping litter	At least daily	At least twice a week
Two or more cats, non-clumping litter	At least twice a day	Daily

Sources: weekly full change and wash from the ASPCA; multi-cat and non-clumping intervals from Purina UK.

You'll find longer intervals online, often "every two to three weeks" for clumping litter, mostly from litter and cat-product brands. Cornell's test is a better guide than any fixed number: litter should be changed "often enough so that it looks and smells dry and clean," and the more cats using the box, the more often that will be. If you can smell the box from the next room, it's overdue.

Why the daily scoop matters

Cats avoid dirty boxes. Cornell notes that some cats refuse to use a box with any urine or feces in it at all. A box that's skipped for a couple of days is one of the most common reasons a cat starts going on the rug, the bath mat or a pile of laundry. Once that habit starts, it can be hard to undo.

It cuts the toxoplasmosis risk. The CDC advises changing the litter box daily, because the Toxoplasma parasite in cat feces doesn't become infectious until 1 to 5 days after it's shed (CDC). Removing it every day means it's gone before it can infect anyone.

If you're pregnant, hand the job to someone else. The CDC's advice is to have someone else change the litter if possible. If no one else can, wear disposable gloves and wash your hands with soap and water afterwards (CDC).

It's how you notice health problems early. Scooping every day tells you what normal looks like: how many clumps, what size, how often. Cornell lists the common signs of lower urinary tract disease as difficult or painful urination, going more often, crying out while urinating, blood in the urine and urinating outside the box (Cornell FLUTD).

A cat straining in the box and producing little or no urine is an emergency, especially a male cat. Cornell says a urethral blockage "is a true medical emergency" and that the time from complete blockage to death "may be less than twenty-four to forty-eight hours." Call a vet straight away, don't wait to see if it passes.

How to do the weekly full change

1. Tip out all the litter and bag it.
2. Wash the box with hot water and a little mild, unscented soap. PetMD advises hot water and a small amount of dish soap, and avoiding ammonia, bleach or other harsh products, which can put cats off the box (PetMD). Cornell also warns against ammonia and vinegar, because they smell like urine.
3. Dry it completely before refilling.
4. Refill with 1 to 2 inches of litter. The ASPCA notes most cats prefer a shallow layer rather than 3 to 4 inches, and generally prefer clumping, unscented litter.

The setup that makes cleaning easier

• One box per cat, plus one. Both the ASPCA and Cornell recommend this, so three cats need four boxes. More boxes means each one fills up more slowly.
• Uncovered and unscented. Cornell says most cats prefer an uncovered box, because covers hold odours in, and unscented litter.
• The right place. Somewhere quiet and private, away from where your cat eats, and reachable at any time of day or night (Cornell).
• Low sides for kittens and older cats. Cornell recommends low-sided boxes for kittens, elderly cats and cats with mobility problems.
• Clean up accidents properly. The ASPCA recommends an enzymatic cleaner designed to neutralise pet odours. If the smell lingers, the cat may keep going back to that spot.

The reminders worth setting

The daily scoop is easiest to keep up when it's tied to something you already do every day, like feeding the cat or making your morning coffee. The full change is the one that tends to slip, because it's weekly and there's always a reason to do it tomorrow. A simple set:

1. Daily, at the same time: "Scoop the litter box. Anything unusual: more clumps, bigger, smaller, blood?"
2. Weekly (for example, Sunday morning): "Full litter change: tip it out, wash the box, dry it, refill 1 to 2 inches."
3. Monthly: "Check the litter supply. Order more if you're down to the last bag."
4. Multi-cat homes: add a second daily scoop and move the full change to every 3 to 5 days.

If the box is a shared job, a reminder also settles the "I thought you did it" problem. The same goes for a teenager who promised to look after the cat, or a partner taking over during a pregnancy.

Let your phone ring for it

A notification that says "litter box" is very easy to swipe away. ReminderIt calls your phone at the time you choose and reads your reminder out loud. If you miss the call, it comes to you on WhatsApp instead. You can set reminders up just by messaging ReminderIt on WhatsApp, for example:

• "Call me every Sunday at 10 am: full litter change, wash the box and refill."
• "Call me on the 1st of every month at 7 pm: check the cat litter supply."
• "Call me every day at 8 pm: scoop the litter box."

You can also add someone else in your household as a person you remind, so the call goes to whoever's turn it is. They get a short verification call first to confirm they're happy to receive reminders.

A weekly or monthly call is the best use of a phone reminder. A daily call works too, but it uses up calls quickly, so it's best kept for the weeks you're rebuilding the habit. There's a 7-day free trial with 7 reminder calls (3 if your number is in a country where calls cost more to place, such as the UK). After that, it's one plan at $7 a month (₹299 in India), with 70 calls a month.

For more on cat care, see our guides to a new kitten's first months, your pet's grooming schedule and pet-sitting for a friend.

The short answer

Scoop the litter box at least once a day (twice with more than one cat), and do a full change, wash and refill about once a week with clumping litter. Do it more often with non-clumping litter or several cats. Keep one box per cat plus one, use 1 to 2 inches of unscented litter, and wash the box with mild soap, not bleach or ammonia. Use the daily scoop to notice changes, and call a vet straight away if your cat is straining with little or no urine. If you're pregnant, let someone else do it.

Sources: ASPCA, Litter Box Problems; Cornell Feline Health Center, Feline Behavior Problems: House Soiling and Feline Lower Urinary Tract Disease; Purina UK, How Often to Change & Clean Your Cat Litter; PetMD, How To Clean a Litter Box Step by Step; CDC, Preventing Toxoplasmosis and People at Increased Risk for Toxoplasmosis.