The equivalent of 161 pounds is 73.03 kilograms. Conversion is done using one of two facts: 1 pound equals 0.454 kilograms or 1 kilogram equals approximately 2.2 pounds.
Using the fact that 1 pound equals 0.454 kilograms for the conversion requires multiplying 161 pounds by 0.454 kilograms per pound. Using 1 kilogram equals 2.2 pounds for conversion requires dividing 161 pounds by 2.2 pounds per kilogram. The kilogram is a unit of mass in the International System of Units, also referred to as the metric system. This system is used in the scientific community and in most industrialized nations in the world. The pound is a unit of weight in the system of U.S. customary units.