500 grams. The prefix "kilo" (symbol k) in the International System of Units (SI) and other systems, which denotes 103, it means one thousand. Therefore, there are 1,000 grams (g) in a kilogram (kg) and 0.001 kilogram equal a gram. Kilograms and grams are units of mass not volume such as liters, gallons, quarts, pints, and cups, and can only be conveted to each other if you have the specific item being measured, as each item has a different density.
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A half kilograms (kg) is 500 grams. "kilo" means 1000, so a kilogram is 1000 grams, a kilometer is 1000 meters, a kilowatt is 1000 watts, etc..