The problem with the whole 'height to weight' BMI thing is, muscle is much heavier than fat ... and it doesn't measure your body fat, and take that in to consideration ...
I used to box, both in high school, and in the air force, and I always boxed as a heavyweight, even though, I am not that big, to look at, but I have a lot of muscle ...
Going by BMI, I need to lose about 28lbs, but, my stomach is flat, and I am in pretty good shape ...
BMI can screw a lot of people up ...
My youngest sister, for instance, is stick thin, but very tall, and works out a lot ... according to BMI, she needs to drop about 7lbs, but there's not a spare ounce on her ... she could actually do with being a bit bigger ...