Posted on January 29, 2023 (Updated on July 10, 2025)

Area Calculation doesn’t work after reprojecting the Vector

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How do you Reproject a vector layer?

Steps for reprojecting a shapefile:



Open QGIS 2.0 desktop. From the menu bar choose ‘Layers’ à ‘Add vector layer’. A dialog box opens, browse to the location of the required shapefile and click ‘Open’. A shapefile will be displayed on the workspace and the name of the file in the ‘Layers’ column to the left.

How do I Reproject coordinates in QGIS?

Go to Settings ‣ Options… On the left panel of the dialog, select CRS. Un-check Automatically enable ‘on the fly’ reprojection if layers have different CRS.



Deactivate “on the fly” re-projection again:

  1. Click on the CRS Status button again.
  2. Un-check the Enable ‘on the fly’ CRS transformation box.
  3. Clicking OK.


Can QGIS calculate area?

To calculate the area of polygons in a shapefile using QGIS, you can use the following steps: Open QGIS and load the shapefile containing the polygons that you want to calculate the area for. Select the layer containing the polygons in the Layers panel. Click the Field Calculator button in the Attributes toolbar.