The best way to gauge how much to feed you cat each day is to use a calculator to give you the exact amount, that way you can measure precisely how much your cat needs. We recommend this cat feeding calculator. From there you can tweak the actual amount based on whether your cat appears to be gaining or losing weight. Remember, every cat is a little bit different, and that includes their dietary needs. Also keep in mind your cat's vocalness about wanting food is not a good indicator of whether they're getting the correct amount. Some cats are just very food motivated and will whine for more food regardless of how full they are. So try not to cave when your kitty begs for more food!