While “square meter” is a simple unit of measurement, “平方米” is tied to immense cultural and economic weight in modern China. It's the central metric in the nation's passionate, and often stressful, obsession with real estate. In the West, people might discuss the price per square foot when buying a home, but in China, the price per “平方米” is a daily topic of conversation, a benchmark of a city's prosperity, and a source of significant social pressure. For many families, their life savings are invested in property, and its value is tracked meticulously through this unit. Owning an apartment of a certain size is often seen as a prerequisite for a man to be considered eligible for marriage. A crucial and often frustrating cultural difference is the concept of 公摊面积 (gōngtān miànjī), or “shared public area.” When you buy a 100 平方米 apartment in China, that number includes your share of the building's common areas like hallways, elevator shafts, and lobbies. Your actual, private, usable living space, called the 套内面积 (tàonèi miànjī), might only be 75-80 平方米. This is a massive difference from the Western practice where the advertised area is typically the actual living space. This discrepancy is a constant source of debate and complaint among Chinese homeowners.
“平方米” is used in any context where you measure area.