The standard washstand in the bathroom is generally round and square. Rectangular washbasin is generally 60-80 cm long and 40-50 cm wide. The size of a circular washbasin is generally 40-60 cm in diameter. If the ratio of bathroom area to price is narrow, the sink can be reduced to about 30 cm in order to save space. Height can be calculated according to the calculation formula. If I subtract 10 cm from half the height, the height is basically a suitable height. For home use, it is necessary to consider the needs of all family members and choose the height suitable for the whole family. The height of ordinary sink is about 60-80 cm, which takes into account the usage habits of most people and is convenient for most people to use.