One cat could cost a little over $1000 per year, you can expect to spend around $2000 for two cats- not including vet visits, though. For two kittens, you’ll need double the food, litter, treats, and numerous other one-time and recurring expenses. Thinking practically, the food and other costs are not much, but the veterinary consultations do cost quite a lot, and that’s definitely something for you to consider. The main factor in the cost of 2 cats vs. 1 is the fact that they’ll both need regular vaccination shots and deworming sessions. Plus, if they get sick, you’ll need to take one or both of them to the vet as needed. And that means your budget needs to be almost twice as much.