determining correct caloric intake

[Carol & Murphy (GA)]

I'm wondering if anyone knows how to determine the correct number of calories I should be feeding my cat.
Unfortunately I am stuck with dry food at present due to apparent GI intolerance of canned food. I will be working on that but in the meantime, wondering exactly how much Purina D/M and Royal Canin glycobalance I should feed (presently a little less than 1/4 cup purina with a few kibbles of glycobalance mixed in for fiber twice a day). This adds up to about 300 calories for my 11.5 lb cat, but I don't know if it's the correct amount. From the charts my cat is about ideal weight.

 

[Larry and Kitties]

That is a good start. I would feed that amount and then weekly weigh Murphy and see if the amount should be increased or decreased.

 

[Critter Mom]

A reasonably-priced digital baby scales is great for weight monitoring. Also here's a body condition chart. It can be a very helpful tool for weight monitoring.