Â· just now. 1  1 kilogram = 1000 gram. dan_BA Â· 1 decade ago. 2  Since there are 1000 grams in a kilogram, there must be 1 / 1000 kilograms in a gram. Alternatively, 0.001 kg/gm or 10^(-3) kg/gm. and so on. 3  A gram is a thousandth of a kilogram. There are a 1000 grams in a kilogram. 4  This Site Might Help You. RE: 5  1000 grams are in a kilogram.