Am i underweight?

I am 17 years old ,plane is 5 ft 1" and weight is 46 kgs. try this just the thing weight calculator, base on age, gender and largeness. It gives you the per cent of race heavier than you, too. And shows you how you compare to others:
http://www.hall.md/ideal-weight/body.ht...
upp well your not below weight but you are skinny i am 5"1 and i am 48 kgs and i am at a dutiful weigt but i want to get to 46 lol