It is appropriate for a 180cm tall boy to weigh around 75kg. There are some differences based on rough algorithms and calculations based on body mass index. 1. Rough Algorithm: Generally, according to 180 minus 105, the weight can be roughly estimated at 75kg, and there can be slight fluctuations. 2. Body Mass Index: Estimating body weight based on Body Mass Index (BMI), which is equal to the number of kilograms of body weight divided by the square value of the height in meters, with the normal value of BMI being 18.5-24kg/m^2. Therefore, a 180cm male should weigh 60-78kg. If a man’s weight is low or high, both are abnormal. It is recommended to eat reasonably and strengthen exercise to ensure that the BMI is within the normal range. If the weight is too abnormal, it is recommended to consult a doctor in time.