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Geographic Information Systems

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    In current versions of QGIS if your data is in a Geographic CRS you can use the function transform() to project the geometries to a projected system (Preferably an equal area one) without the need to duplicate your data. In the Field calculator, something like this should work: area($geometry, 'EPSG:4326','EPSG:3763') Commented Feb 3, 2016 at 23:11
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    @AlexandreNeto: Do you mean area(transform($geometry, 'EPSG:4326','EPSG:3763'))? Commented Apr 20, 2017 at 5:33
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    As of QGIS 3.14, I believe that the units of the $area and $length are in the units that are set in the project preferences, NOT in the layer's units. Be really careful with this. Commented Oct 28, 2020 at 15:47
  • Note that just because a projection has meters as its map unit, doesn't mean it represents areas accurately. Therefore, it's best to use an equal area projection. Commented Nov 30, 2021 at 11:16