The size and type of litter box affect the amount of litter used. Generally, the larger the litter box, the more litter is needed. Also, closed litter boxes require less litter than open litter boxes.

In addition, the type of cat litter is also an important consideration. Different types of cat litter have different properties such as absorbency, clumping, and stickiness, so the amount needed will also vary. For example, clumping cat litter usually requires less material because its clumping properties are good and can effectively trap the cat's excrement. Non-clumping cat litter, on the other hand, requires more material to better absorb urine and mask odor.