Moderation is key
The nutritional value of treats is not all that important because they should only be a tiny part of a cat’s diet. I recommend somewhere in the range of 5-10% of total calories. Calorie counts for commercially prepared treats are not always printed on the label but should be available on the manufacturer’s website or by calling them directly. The USDA’s food-a-pedia is an excellent resource for this type of information for human foods.