In order to really figure out the protein in a can of cat food one has to first calculate the dry matter. I'm a bit out of my depth here as I am a rotten mathematician, but here goes...
Subtract the percentage of moisture from 100% to calculate the dry matter. Once you've calculated the dry matter, you can do a dry weight analysis...
Royal Canin Kitten has a moisture content of 80%, a difference of 20%. 20% is the dry matter. The protein percentage in this can is 11%, so if you divide 11% by 20% you come up with 55%, which is actually quite high. Please correct me if I've done that calculation incorrectly, as I'm pretty inept at this, but the calculation does have to be done if you want to compare canned to dry properly.
Subtract the percentage of moisture from 100% to calculate the dry matter. Once you've calculated the dry matter, you can do a dry weight analysis...
Royal Canin Kitten has a moisture content of 80%, a difference of 20%. 20% is the dry matter. The protein percentage in this can is 11%, so if you divide 11% by 20% you come up with 55%, which is actually quite high. Please correct me if I've done that calculation incorrectly, as I'm pretty inept at this, but the calculation does have to be done if you want to compare canned to dry properly.