Metric weight is a system of measurement used to measure the mass or weight of an object. The most commonly used units of metric weight are kilo (4 letters), tonne (5 letters), GRAM (4 letters), kilogram (8 letters) and DRAM (4 letters). A kilo is equal to 1000 grams, a tonne is equal to 1000 kilograms, a GRAM is equal to 0.001 kilograms, a kilogram is equal to 1000 grams and a DRAM is equal to 1/16 of an ounce.