On 18/05/17 18:41, Blumentrath, Stefan wrote:
Hi James,

QGIS uses a ellipsoidal area measurement, while GRASS (like most of the other 
GIS) uses a Cartesian measurement (others, please correct me if that is not the 
case in WGS84).

See amongst others:
https://issues.qgis.org/issues/12057 and
https://issues.qgis.org/issues/14675

Would you mind comparing area measurement of a third software (SAGA, PostGIS, 
...)?

I would suggest making tests with polygons of which you know the area (e.g. simple squares to begin with)

Moritz
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