There are 1,000 kilograms (kg) in a metric ton, or more properly; tonne Although "ton" is the correct usage in the USA, In the UK It is tonne.
1,000 kilograms = 1 metric ton
Rounded to two decimal places, 6 tons (short tons) is equal to 5443.11 kilograms.
5,443.11 kilograms (12,000 pounds)
1,000