1 Kilogram (kilo) = 1000 Grams
In metric system, the prefix "kilo" means the factor of 1000 or "times a thousand", that makes easier to remember how to convert from kilograms to grams, because if you replace the "kilo" with "1000", kilogram means 1000 grams.
For example, to find out how many grams in a kilogram and a half, multiply the kilogram value by the conversion factor, 1/2 kg * 1000 (g in 1 kg) = 500 grams in 1/2 kg.
Kilogram (kilo) is the base unit of mass in metric system and equals to the mass of one liter (litre in SI spelling) of water or in other words, equals to the mass of a cube of water with the length of all sides are 10 centimeters, that makes 10 * 10 * 10 = mass of 1000 cubic centimeters of water (1 L is 1000 cm3 or cc). 1 kilogram equals to 2.20462262 pounds or 35.274 ounces. The abbreviation of kilogram is "kg".
Gram is a metric system unit of mass. It is one thousandth (1/1000) of a kilogram that is the metric system base unit of mass. 1 grams equals to mass of 1 cubic centimeter (abbreviated as cm3 in SI and cc in other measurement systems) of water or the mass of 1 mL of water. The abbreviation of gram is "g".