Is this a good weight for me?

I'm sorry but thats not a healthy weight you are 4 lbs underweight for your age but don't go go trying to get more fat. You will naturaly gain weight while you are growing. Just don't try to lose any either. As long as you are that slim the healthy way, just because you have a healthy lifestyle, you are fine. However if you have been trying to be like that by skiping calories and things like that it is not.

Try getting some muscle and using a body fat percentage calculator instead, bmi can be very inaccurate.

At you age, you are about 5 pounds under-weight, but the bmi calculators aren't always correct, so if you are developing slowly, or have a very active life style, or both, then your weight could ben perfectly normal. I weighed about 93 pounds last year ( I'm 15 right now ) and I've been 5 ft 5in the past 1 1/2, so you seem to be fine.

No you are underweight by about at least 6 pounds.Try eating more low fat protein.

Even if you're a girl, you're underweight. By at least 20 lbs.

No way, try gaining at least 20lb.

thats so skinny! eat ice cream :)