1. Two and a half jin is equal to 1.25 kilograms.2. "Jin" is a traditional Chinese unit of mass, while "kilogram" is the internationally recognized unit of mass.3. The conversion rate between jin and kilograms is 0.5 kilograms per jin, which means 1 kilogram is equal to 2 jin.4. To convert a measurement from jin to kilograms, simply multiply the quantity in jin by the conversion rate to obtain the equivalent in kilograms.5. For example, how many kilograms is 2.5 jin? Multiply 2.5 by 0.5, resulting in 1.25 kilograms.