1 is actually mislabeled, that would be your cat from 8 to 20 points, depending on your cat, the smaller the cat the lower the healthy weight is obviously.
If your cat is a healthy weight you will see the silhouette of their ribs when they stand, if your cat is ovular when they stand they are a little overweight, if your cat is more round, your cat is obese, which is not healthy for your cat. Anything above that is incredibly unhealthy.