I think thats a really bad measurment. I went to a
fitness instructor and he told me my ideal weight would be 70 kgs (154 lbs)... and I am 5'4. But.. I also don't have a small frame.. I weightlift and have really damn nice muscles on my arms and legs. Remember, muscle weighs more than
fat. Ideal weight is not something that is a one fit all kind of thing. Personally I suggest going to a
fitness instructor and asking him what would be ideal for you. If you have a thick frame like me... it may not be as low as you think.