I too am a product of the American school system and never figured out the metric system. But, I found a website: http://www.worldwidemetric.com/metcal.htm to do the conversions for me. So...

Halo - 11 pounds - 4.9895 kilograms
Cammie - 9 pounds - 4.0823 kilograms
Molly - 9 pounds - 4.0823 kilograms
Seymour - 17 pounds - 7.7111 kilograms
Miss Cinnabuns - 5 pounds - 2.2680 kilograms
Jett - 17 pounds - 7.7111 kilograms
Gray Boy - 22 pounds - 9.9790 kilograms

You guessed it - Seymour and Gray Boy are on a diet. They haven't lost any weight but Miss Cinnabuns has and she can't afford to. The vet says she's in good health so Mom tries to feed Miss Cinnabuns all by herself in another room so that the piggies can't get to her un-diet food.

BTW, Seymour and Gray Boy are the only males. I find it interesting that they are the major chow hounds.