The short answer
Clumping litter forms scoopable clumps where it gets wet. Non-clumping litter absorbs moisture without forming those clumps. Compare how often you top up and replace each litter, then use the number of days a bag lasts to estimate its monthly cost.
How cleanup changes with each type of litter
| Task | Clumping litter | Non-clumping litter |
|---|---|---|
| Scooping | Remove urine clumps and solid waste. | Remove solid waste. How you handle wet litter depends on the product and tray. |
| Topping up | Record the fresh litter you add after removing clumps. | Record any top-ups between full changes. |
| Full changes | Count how often you empty the tray and how much goes back in. | Count the litter used for full replacements, which may happen more often. |
Follow the instructions for each product when you compare, so the record reflects how you would actually use it.
What to check on the bag
Many clumping clay litters use sodium bentonite, which swells when wet and helps form a clump. Some corn and wheat litters clump too. Non-clumping products can be made from clay, paper, wood, or silica gel. Read the label for the material, clumping behavior, and change instructions. For more on the materials, see Chewy’s veterinarian-reviewed litter guide.
Which cat litter costs less over 30 days?
Use the checkout price, including the bag’s share of shipping and tax, and the number of days the bag lasts.
30-day cost ≈ bag cost ÷ days it lasts × 30
| Type | Bag cost | Days per bag | 30-day cost |
|---|---|---|---|
| Clumping | $20 | 40 | $15 |
| Non-clumping | $15 | 25 | $18 |
The $15 bag costs $0.60 per day. For the $20 bag to beat that, it needs to last at least 34 whole days. If it lasts 40 days, the household saves $3 per 30 days. Once you have a formula you like, use the unit price calculator to compare its package sizes.
Track how long one bag lasts
Copy this into a note and fill it in for each litter your cat uses. Keep the same household and box setup where practical. Start tracking once your cat is using the litter regularly.
- Product and net weight: ___ / ___ lb. Checkout price: $___.
- Date opened: ___. Date used up: ___. Days between dates: ___.
- Boxes supplied: ___. Top-ups: ___. Full changes: ___.
- 30-day cost: $___ ÷ ___ days × 30 = $___.
If you have overlapping bags or multiple boxes, use the monthly cost guide to track pounds used across your household.