The following figure is an internationally accepted formula for calculating body mass index. By corresponding the body mass index calculated by this formula to the corresponding range, you can know your best weight range.
The figure below shows the corresponding body mass index scale.
According to weighing scale, the optimal weight of height 170cm is 6 1kg-63kg.
But this is only the approximate weight calculated according to the weight and height. It's not the size.
People with similar height and weight will also have great differences in body shape, mainly depending on the ratio of muscle to fat. In our body composition, the ratio of muscle to fat seriously affects our body shape.
The figure below is a volume comparison chart of fat and muscle with the same weight. At the same weight, fat is much bigger than muscle. Then we regard fat people as fat people and muscular people, and you will find that even if they are the same weight, one looks fat and the other is well-proportioned.
On the whole, a person with a height of 170cm should weigh 6 1kg-63kg. The subject can take this weight as his goal first. After reaching this weight range, if he still feels fat, he can continue to lose weight, increase strength training, gain muscle and shape.