The multi-cat household supply budget: litter, food and the maths

Two cats cost more than twice one cat in some lines and noticeably less in others. Costing a multi-cat household properly means knowing which is which, because the savings live in the lines that do not scale.

What scales per cat

Food scales almost exactly: two cats eat two cats' worth, and the per-day method in wet food vs dry food for cats simply doubles. Litter scales a little better than linearly in a shared-box home, since boxes are topped up rather than multiplied; a rough planning figure is 15 to 20 lb per cat per month, with the household total usually landing under the straight multiple. Flea and tick prevention scales exactly and steps up by weight band per cat, which makes it one of the biggest lines in a multi-cat budget; see flea and tick costs compared.

What does not scale

Boxes, furniture, feeders, and fountains are bought per household, not per cat. The usual guidance of one box per cat plus one spare is a one-off setup cost, and a good automatic feeder serves the whole household. These are the categories where buying quality once beats buying cheap twice; the tracked ranges are under cat furniture and feeders and fountains.

Where the multi-cat saving hides

Bulk. A household using 50 lb of litter a month is exactly the household that big bags and genuine stock-up prices were made for: the per-pound gap between a 40 lb bag at a low and a 14 lb bag at an ordinary price, worked through in cat litter cost per pound, is worth hundreds of dollars a year at multi-cat volumes. The same applies to the largest dry food bags, subject to the freshness limit in how to store dry pet food: more cats finish a big bag faster, so multi-cat homes can use sizes a single-cat home should not buy.

A planning template

Monthly food: cost per day per cat, times cats, times 30. Monthly litter: pounds per cat, times cats, times your usual cost per pound. Prevention: monthly cost per cat, times cats. Everything else is an occasional purchase, best bought at tracked lows rather than budgeted monthly. Run your own numbers through that template once and the budget mostly runs itself, with price alerts on the top three repeat products doing the watching.