Lb (pound) is a British unit of mass, which is often used to describe the weight of an object. 1 lb is equal to 0.45359237 kg. The unit of mass in China is Jin, and 1 Jin is equal to 0.5 kg. Therefore, the weight of barbell pieces can be converted from pounds to kilograms according to the following formula: 25lb * 0.45937kg/lb ÷ 0.5kg/kg ≈ 22438+085kg.

The weight of barbell pieces from different manufacturers may be slightly different, so it needs to be measured accurately according to its actual situation in specific practice.