normal adult size

[nita]

What is the average/max adult size weight wise. The scale I'm waiting on goes to 30lbs. I currently don't have one, ordered hasn't arrived but I plan on keeping better records of weight (currently it is, yup they have gotten bigger) and am wondering what I can expect for an average max weight. My babies are only 1 1/2 yrs old but eat well and are getting bigger by the week. I will hopefully borrow my sisters camera and post some digital pics in a while thanks.