How many tonnes in one metric tonne?

One.

Metric tons and metric tons have the same magnitude, so a value in metric tons is already a value in metric tons.

The material desnsity is required for the answer to be possible.

1 tonne = 1000 kg (A tonne is a metric ton.)

There is 1.10 short tons in one Metric ton. A Metric tonne is 1000 kilos which equals 2200 pounds.