1000mk is equal to 1 g, and the unit conversion relationship between kilograms and grams is: 1 kg is equal to10000 g. kg: it is a measure of quality in the international system of units. One kilogram is defined as the mass of the international kilogram original device, which is almost as heavy as one liter of water. The kilogram is the only basic unit prefixed by the international system of units, and it is also the only international unit still defined by artificial products.