Well the site you listed looks pretty reputable, but like anything these equations are for the "average" person and doesn't take into consideration people who lack a lot of lean mass or have a
bodybuilding physique.
BMI and
body fat percentage, while not completely accurate when using the more simple methods, can act as a benchmark for
fat loss especially if the scale isn't moving.
Body fat percentage - Wikipedia, the free encyclopedia Body Mass Index (BMI) - Wikipedia, the free encyclopedia
As far as what you should weigh, a good estimate can come frame size, height, and gender. You don't want to be totally lean as a certain percentage of
body fat helps maintain normal biological activity.
