Cat Litter Cost per Month Compared (2026): Clay vs Tofu vs Crystal vs Corn on Clumping, Refill Frequency and Cost per Cat

The question we field most often at the litter shelf isn't "which litter is best" — it's "which one will I actually buy the fewest bags of?" Customers standing in front of a 17 kg box of clay and a 6 L bag of tofu litter want the same thing: the real monthly spend for one cat, not the shelf price of a single bag. Here's the short verdict before the details: clumping clay still delivers the lowest cost per cat per month for most single-cat households, while tofu and corn cost more per month but cut litter weight and tracking, and crystal only wins when you want a once-monthly change rather than daily scooping. You can compare formats side by side in our cat litter collection.

Because litter prices move with grain markets, freight and pack size, we don't publish dollar figures in articles — current pricing lives on the product pages, and our price match guarantee covers what you find elsewhere. What we can pin down precisely is the thing that actually drives your monthly bill: how many kilograms or litres each litter type consumes per cat, and how often you're back for a refill. Everything below assumes one adult cat, a pan filled to a 5–7 cm depth, daily scooping, and a standard open or hooded box. Double every consumption figure for a second cat, and add roughly 30% on top for a third.

Clay and crystal: the mineral litters

Sodium bentonite clay remains the lowest-cost-per-month option for a single cat in Canada, consuming roughly 4–6 kg of fresh litter monthly once you account for clump removal and top-ups. Crystal silica gel runs at the opposite extreme — about 1.8 kg per cat per month — but costs more per kilogram, which cancels most of the savings.

Clay works by swelling on contact with moisture. The clump seals, you lift it out, and the rest of the bed stays usable. That mechanism is why a 17 kg box stretches three to four weeks for one cat: you're removing maybe 150–250 g of clumped waste a day and replacing only that volume. Brands like OdourLock and Arm & Hammer sit in this group, and both rely on grain sizes fine enough that cats accept them readily — substrate-preference research indexed on the National Center for Biotechnology Information has consistently found cats favour fine, sand-like particles over coarse pellets. Clay's downsides are weight and tracking: you're hauling 11–17 kg up a walkup, and finer grains ride out on paws onto hardwood.

Crystal litter is a different animal. Silica gel granules absorb urine and release the water content as vapour, leaving minerals behind. There's no clump to scoop — you remove solids daily, stir the bed every day or two, and dump the whole pan around the 30-day mark when the crystals saturate and start yellowing. For a single cat, one 1.8 kg bag per month is typical. Two cats in one crystal box will usually saturate the bed in 12–16 days, which is where crystal's economics fall apart fast.

Who each suits: clay suits budget-focused households, multi-cat homes, and anyone who wants the hardest possible clump. Crystal suits a single cat with a tidy owner who'd rather stir once a day than scoop, and who prioritizes very low dust — a real consideration if someone in the home has respiratory sensitivity.

Tofu and corn: the plant-based litters

Plant-fibre litters cost more per month than clay — typically 1.5 to 2 times as much per cat — but they cut carried weight by roughly half and dramatically reduce tracking. Tofu litter runs about 12–18 L of volume per cat per month; corn litter runs about 5–7 kg.

Tofu litter is made from pea or soybean fibre, usually extruded into 2 mm pellets or short rods. It clumps softly, absorbs fast, and weighs about 0.4 kg per litre compared to clay's roughly 0.9 kg per litre. That's the real-world appeal: a month's supply fits in one tote bag instead of a cart. The trade-off is clump strength. Tofu clumps hold together well when scooped within 24 hours but crumble if you leave them sitting for three days, which means tofu rewards daily scooping and punishes a weekend away.

Corn litter — whole-kernel ground corn, as used by World's Best Cat Litter, or the corn-and-cassava blend in Sustainably Yours — sits between clay and tofu on both cost and clump strength. Corn's natural starches create a medium-firm clump that scoops cleanly at about 0.5 kg per litre. Both products are lighter than clay by roughly 45% for the same box volume, which is why a 5.4 kg corn bag fills a standard pan to a similar depth as a 9–10 kg clay box.

One honest caution on plant litters: manufacturers often describe them as septic-safe or flushable in small amounts. The ASPCA and most municipal wastewater guidance recommend bagging cat waste rather than flushing it, because Toxoplasma gondii oocysts are not reliably removed by standard water treatment. Scoop into the green bin or garbage per your local rules.

Who each suits: tofu suits condo and apartment households — the kind of fourth-floor Yonge-and-Finch setup where every bag gets carried by hand — plus anyone fighting litter tracking across small floor plans. Corn suits owners who want plant-based materials without giving up clump firmness, and who scoop daily.

What our staff recommends

Our team at Ashario Pets recommends matching litter to your scooping habit first and your budget second, because the cheapest litter in the world costs more if you dump the whole box weekly out of frustration. That single habit — scooping once every 24 hours — stretches clay and corn by about a week per box and is the biggest lever on monthly cost most owners never pull.

In our store we see three recurring patterns. Multi-cat households almost always end up back on clumping clay after trying alternatives, simply because three cats generate enough volume that a $$$ tier litter becomes a weekly purchase. Apartment owners who switch to tofu rarely switch back, even knowing it costs more, because weight and tracking were their actual complaints. And people who buy crystal for a two-cat home usually return within two months asking why it stopped controlling odour — it didn't fail, it just saturated early.

When customers ask about transitions, we suggest mixing 25% new litter into the existing bed for four or five days, then 50%, then 75%. Abrupt switches are a common trigger for out-of-box urination. If a cat is straining, urinating outside the pan, or producing unusually small or frequent clumps, that's a veterinary question, not a litter question — the American Veterinary Medical Association flags litter-box changes as an early sign of lower urinary tract disease, and it should be assessed by your own vet promptly.

Diet is the quiet factor behind litter consumption. Cats eating only dry food typically produce larger, more frequent urine clumps than cats getting part of their calories from moisture-rich food, because canned diets run roughly 75–80% moisture versus about 8–10% in kibble. Adding one 85 g can per day — usually 70–100 kcal depending on the recipe — to a diet that already meets AAFCO standards for adult maintenance can measurably increase water intake. Check the guaranteed analysis for protein content and confirm taurine is listed; you can compare moisture and kcal figures across our wet cat food and dry cat food ranges, and the AAFCO nutrient profiles explain what those label panels have to contain.

Cat litter cost questions we get asked at the counter

What is the cheapest cat litter per month in Canada?

Clumping sodium bentonite clay is the cheapest litter per month for most Canadian households, costing roughly half what tofu or crystal costs per cat. One cat consumes about 4–6 kg of clay monthly with daily scooping, meaning one 17 kg box lasts three to four weeks. Buying the largest pack size lowers your cost per kilogram further.

How long does crystal litter last for one cat?

Crystal silica gel litter lasts about 30 days for one adult cat when you remove solids daily and stir the bed every one to two days. Expect 1.8 kg per cat per month. Two cats sharing one crystal box will typically saturate the granules in 12–16 days, so plan one box per cat.

Is tofu cat litter better than clay?

Tofu litter isn't better across the board — it's lighter and tracks less, while clay clumps harder and costs less per month. Tofu weighs roughly 0.4 kg per litre versus clay's 0.9 kg, so a month's supply is about half the carrying weight. Choose tofu for apartments and low tracking; choose clay for cost and clump strength.

How much corn cat litter does one cat use per month?

One adult cat uses about 5–7 kg of corn litter per month, meaning a single 5.4 kg (12 lb) bag covers roughly three to four weeks with daily scooping and a full dump at the end. A 10.9 kg bag covers about seven weeks for one cat, or three to four weeks for two cats sharing two pans.

At a glance: For one cat, clumping clay is the lowest monthly cost at about 4–6 kg used per month, corn sits mid-tier at 5–7 kg, and tofu and crystal cost the most per month while cutting carried weight to 2–8 kg. Daily scooping and a 5–7 cm fill depth extend every litter type by roughly a week per box. Match the material to your scooping routine first — that decides your real spend more than the sticker price does.

Our store at 1111A Finch Ave W, Unit 2, North York, ON M3J 2P7 is open 7 AM to 11 PM daily, with local delivery available via DoorDash and other apps. Bring in a photo of your current litter label and our staff will work out your per-cat consumption with you.