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I'm working in a black QGIS project set to EPSG:27700 and a layer in EPSG:2770. When I measure the area of a polygon using the measure tool I get a value of 7594315ha. When I subsequently do this in the field calculator using $area/10000 to return the value in hectares I get a value of 3. I'm not sure why this is so small as I've never had an issue with this before and both project and layer are in the same projection.

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    what does the yellow warning box say? Can you maybe add a larger screen shot so we can see some detail
    – Ian Turton
    Nov 12, 2020 at 8:25

1 Answer 1


This was solved by going to Project>Properties>General and changing units for distance measurement to meters rather than square miles which had come in as default.

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