Cat Food Nutrition Calculator Based on The Cornell Book of Cats Nutrition Information*
Read the "Guaranteed Analysis" statement on the package of cat food, and use the yellow boxes to enter the protein, fat, fiber, and moisture percentages from the label. If "ash" is listed, or if any other minerals add up to more than 1%, enter the total in the yellow box for Ash.
Don't worry about the fact that the percentages are listed as "minimum" or "maximum" - just enter the numbers. The actual analysis is supposed to be within a percent or two of what they list. But if you get weird results, like negative values for carbohydrates, this inaccuracy in the guaranteed analysis is why.
Read the percentage of carbs in the food, the calories per 100g of food, and the calories per ounce of food, based on the numbers you entered.