80 to around 155 pounds but it all depends how tall and how much you eat because your age doesn't connect with your weight.
The average 13 year old's weight is about 105-135 lbs.
110-150
the average is about 5'6 to 5'7 and 140.
40-50 lbs.
Around 70 to 80 pounds or so.
i am an athlete and a 11 year old girl i weigh 74lbs
50lbs for smaller people and about 80-70lbs for average people
The average height of a 13 year old girl is 5 feet-5'3 feet. While the average weight 95 pounds-105 pounds.Remember this is just average and everyone is different.
The average body weight in 12 year olds: Girls should be around the 35kg mark while boys would be on an average weight on 37-38kgs
You can not calculate a healthy weight by age and average as everybody is genetically differant. The best way to check the health of the twelve year old is. BMI, (body mass index), which is calculated by either:- Height and weight. OR Weight and waist size.
It weighs the same as an adults, which is 3lbs.
I don't really know but I'm 10 I'm 4'6 and I weigh about 70 pounds