142lb = 64.41kg.
http://wiki.answers.com/Q/How_many_kilograms_are_i...

1. Convert from pounds to kilograms by taking the number in pounds and dividing it by 2.2. For example, a man weighs 200 lbs. so 200 / 2.2 = approximately 91 kg. 2. Convert from kilograms
http://www.ehow.com/how_4578188_convertpoundskil...

1. Determine the value in pounds (represented by "lb" in the formula) you want to convert to kilograms and insert it into the blank space below. _ lb. * 1 kg. 2.2046226218
http://www.wikihow.com/ConvertPoundstoKilograms
