How Often Should You Change Cat Litter? A Simple Schedule That Works

Ask five cat owners how often they change the litter and you'll get five different answers — usually somewhere between "every few days" and "when the smell tells me to." The honest answer: it depends on your litter type, your cat count, and whether you scoop daily. Here's the schedule that keeps a box fresh without wasting litter or money.

The short answer

• Scoop: once a day, every day (twice in the first week with a new litter).
• Top up: once a week, to keep the bed 2–3 inches deep.
• Full change + box wash: every 3–4 weeks for clumping plant litters like tofu, every 1–2 weeks for non-clumping clay, monthly for silica crystals.

Why litter type changes the math

With a good clumping litter, daily scooping removes nearly everything that smells — urine leaves in firm clumps instead of soaking into the bed. That's why clumping tofu litter can stretch a full change to a month, while traditional non-clumping clay saturates and needs dumping every week or two no matter how diligently you scoop.

Silica crystals absorb urine rather than clumping it, so the crystals themselves last about a month — but they stop absorbing all at once, which is why a crystal box can go from "fine" to "unbearable" overnight.

The multi-cat rule

Two cats don't double your schedule — they double your volume. Keep the same scoop-daily cadence, but expect to top up twice a week and do full changes closer to the 3-week mark. The standing recommendation of one box per cat plus one spare still applies; litter schedules fail most often because there aren't enough boxes, not because of the litter. (Not sure how much litter your household actually needs? Our 60-second litter quiz does the math by cat count.)

Signs it's time for a full change — early

• Odor returns within a day of scooping.
• The bed feels damp or sandy at the bottom of the box.
• Your cat starts perching on the edge or digging less than usual.
• Clumps crumble instead of lifting out whole.

That last one is also a depth problem — a shallow bed makes weak clumps in any litter. Stay at 2–3 inches and most "my litter stopped working" complaints disappear. More fixes in our guide to getting rid of litter box smell.

The wash itself

At each full change: dump everything, wash the box with mild dish soap and warm water (skip ammonia and bleach — both read as "another cat was here" to your cat), dry it completely, then refill. Five minutes, once a month, with a flushable litter and no heavy bag to haul.