The average monthly cost of cat food for people with cats is between $16.00 to $40.00 per month depending on how many cats they have and what brand of cat food they buy for their cat.
For my one cat that I have it cost me only $20.00 per month in cat food which is not all that much.
Actually it really costs me a bit less because I pay for $20.00 for a big bag of cat food which actually lasts at least 3 months because my cat doesn't eat all that much.
But I usually buy a big bag of cat food every month or at least every other month depending on how much cat food is leftover.
I just like to never run out of cat food just in case we get a winter storm or something else bad happen here where I cannot get to the store.
So actually I would say that it likely only costs me $7.00 to $8.00 per month in cat food even though I buy a huge bag each month or at least almost every month.
If you buy more expensive cat food and have more casts then it can cost you more money each month but it should not cost you all that much for cat food.