Divide pounds by 2.2 to get the number of kilograms. For example, if an object weight 220 pounds, divide 220 by 2.2 to get 100 kilograms.
Multiply the number of pounds by .454 to get kilograms. Using the same weight, multiply 220 pounds by .454 to get 99.88 kilograms, which is 100 when rounded.
Convert kilograms to pounds with multiplication only. Multiply the weight in kilograms by 2.2 to get pounds. For example, multiply 100 kilograms by 2.2 to get 220 pounds.