It depends on your height, dear. For example, 1.680 kg means that you have lost weight. There is a formula to calculate.

Calculation method

Male: (height cm-80) × 70% = standard weight.

Female: (height cm-70) × 60% = standard weight.

Standard weight plus or minus 10% is normal weight.

Standard weight plus or minus 10 ~ 20% overweight or underweight.

Obesity or underweight is defined as plus or minus 20% of standard weight.