The prefix "kilo" means 1,000, so there are 1,000 grams in a kilogram. One kg = 2.205 pounds. A cube of water 10 centimeters on each side has a mass of 1 kg. For the "official standard" See: The links below
Interactive Learning Paradigms Incorporated ILPI (Knowledge at the Speed of Light), The MSDS Hyper Glossary (Home Page of the Material Safety Data Sheet Hyper Glossary), ILPI, NJ, USA 2011. http://www.ilpi.com/msds/ref/index.html, (MSDS - Amer) {448}