The imperial system equivalent of 125 kilograms is 275.578 pounds. On Earth, 2.2046 pounds is the equivalent of 1 kilogram. To convert from kilograms to pounds, multiply the number of kilograms by 2.2046.
A kilogram is defined as the mass of a block of platinum iridium alloy, the International Prototype of the Kilogram (IPK). The IPK was created in 1889 and is stored at the International Bureau of Weights and Measures in Sevres, France. The kilogram is the SI unit for mass in the metric system. The pound is a unit of weight that measures the gravitational force acting on an object; it is also one of the rare imperial system measurements still commonly used in countries that utilize the metric system.