The world uses for measuring of mass or weight the SI units kilograms or grams. Only three nations have not officially adopted the International System of Units as their primary or sole system of measurement: Liberia, Myanmar and the United States. Scroll down to related links and look at "The not kilogram and gram countries".
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Use grams and kilograms when referring to mass in metric units. Don't confuse with weight, Newtons in metric.
kilograms
Kilogram
Grams and kilograms are measurement of weight. For a letter you would use grams. For a package you would use kilograms as it weight is more.
kilograms
kilograms because grams are smaller than kilograms.