Cat litter calculator: how much you use, how long a bag lasts and what it costs
Enter how many boxes you fill and how often you change them, and see pounds per month, monthly cost and the cheapest bags.
Cat litter calculator
Enter how many boxes you fill and how often you change them. The amounts are starting figures you can change.
Prices are Amazon listing prices as of 2026-11-05; check the price on Amazon before you buy.
Common questions
1How often should you change cat litter?
Scoop clumping litter at least once a day and do a full change about every 2 to 4 weeks, washing the box. Non-clumping litter needs a full change more often, commonly every 4 to 10 days. Enter your own schedule above to see what it costs.
2How much cat litter should I use?
A depth of about 3 to 4 inches suits clumping litter and 2 to 3 inches non-clumping; a standard box takes roughly 5 to 10 pounds for a full fill. Set the pounds per change above to your own box.
3How long does a bag of cat litter last?
Divide the pounds in the bag by the pounds you use a month. The list shows how many days each bag lasts for the numbers you enter. One box with a daily scoop and a monthly full change often uses 15 to 25 pounds a month.
4How much does cat litter cost per month?
Pounds per month times the price per pound. The calculator shows it for the cheapest listings and a mid-priced one so you can see the range.
5How many litter boxes do I need?
A common recommendation is one box per cat plus one extra. More boxes use more litter, so enter the number of boxes you actually fill.
6Does cheaper litter work as well?
Not necessarily: odour control, dust and tracking differ, and so does how much litter you use. We rank by price per pound and do not rate performance.