The meaning is incredibly logical and transparent: “Accumulating (积) the little (少) becomes (成) a lot (多).” The structure of the idiom itself tells the story of gradual growth.
The concept of `积少成多` is a cornerstone of Chinese cultural values, deeply intertwined with virtues like thrift (节约 jiéyuē), diligence (勤劳 qínláo), and perseverance (毅力 yìlì). It's a philosophy taught to children from a young age, often in the context of saving pocket money or applying themselves to their studies. A useful Western parallel is the proverb “A penny saved is a penny earned” or “Many a little makes a mickle.” However, `积少成多` has a much broader application. While the Western phrases often lean heavily towards finance, `积少成多` is just as likely to be used to describe the accumulation of knowledge, experience, goodwill, or even environmental impact. It represents a fundamental belief that consistent, small, positive actions are the true path to any great achievement, standing in contrast to the Western “get rich quick” or “overnight success” narratives. It champions the process over the instant result.
`积少成多` is a highly practical and common idiom that you will hear in various contexts, from formal to informal. Its connotation is always positive and encouraging.