‘千克’ is the standard Chinese unit for mass, equivalent to the international ‘kilogram’. It is a compound word formed by ‘千’ (qiān), meaning ‘thousand’, and ‘克’ (kè), meaning ‘gram’. Literally, it means ‘one thousand grams’, reflecting the metric system’s decimal structure. This term is used universally in scientific, commercial, educational, and everyday contexts—such as weighing food, measuring body weight, or reporting product specifications.

In spoken and written Chinese, ‘千克’ is formal and preferred in official, technical, or precise settings; however, in casual daily speech, many native speakers use ‘公斤’ (gōngjīn) instead, which carries the same meaning but feels more colloquial and natural in conversation. Both terms are fully interchangeable in meaning, but ‘千克’ appears more frequently in textbooks, lab reports, and government documents due to its alignment with SI unit terminology.