The confusion may be due to the fact that kibble sizes may differ in size and weight between different dry cat foods. Cups are a measure of volume while kilograms (kg) are a measure of weight. Therefore, a dry cat food that is made of large kibbles that take up space may fill up a cup but weigh less than another dry cat food that contains smaller kibbles. A good analogy would be to compare a pound of styrofoam to a pound of gold. Gold is denser so it would take up less space than the pound of styrofoam. The same would hold true for small kibbles that are heavier (one could fit more kibbles in a cup compared to larger, less dense kibbles). With respect to a guideline for calorie control, the best advice for a pet owner would be to use the value listed in calories per cup. Most pet owners feed on a volume basis and will offer a certain amount of cups per day. This is much easier than using a scale to weigh food on a daily basis.
Source: http://www.catchow.com
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