Finding the centroid of a irregular shaped 2d surface

I am wondering if Blender is able to find the centroid of an irregular shaped flat 2d surface?
I intend to import a 3d model of a motorcycle petrol tank that has been created using photogrammetry software (Photomodeler Lite) into Blender.
I need to find the centre of one side of the petrol tank so I can place a decal/badge in a central location.
I just want to do this as an exercise and would like to know if Blender can be made to calculate centroids.


if i remember well the center is the centroid or the center of mass

so just re- center it in F9 and it should do it automatically !