It is very important to keep our cat at an adequate weight. Unless your vet advises otherwise, you should try and keep your cat in the weight-range typical for his or her breed and gender.
Here we present a chart of the weight distribution for Maine Coon cats. The weight of a typical female ranges from 3.8kg to 6.2kg and that of a male from 5.3Kg to 8.1kg. That is, 8.4lbs to 13.7lbs for females and 11.7lbs to 17.9lbs for males.