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List of fields

I use QGIS Bonn 3.2.0 So my question is how can i calculate Ha for specific fields i marked on picture. Is there any tool and if yes which and how to use it?

  • where do you want those values? if in a new column, check this (old, but still valid; also this is then a duplicate). you can use the field calculator also on selected fields only. for a quick glance, use the Info tool on a feature; you can find the spherical polygonal area under derived, in meters squared (mental math keeps you young). – ThingumaBob Oct 22 '18 at 9:09
  • I asked becoue latest answered was on version 2.2 or smth and this is 3.2, so I hope this will not go into duplicate. – Roby5 Oct 22 '18 at 10:59
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If you mean Hectare the function you are looking for is $area

$area returns the area as map units so in a projected coordinate system it would be meter. Thus you need to divide the result by 10,000.

Create a new field with type numeric/float and use the field calculator with the formula $area/10000

  • I have few more question: do I need to choose every layer each time or is there way to just like copy paste from one to another? – Roby5 Oct 22 '18 at 11:24
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    @Roby5 You will need to create a new field and run this calculate for each layer. – LaughU Oct 22 '18 at 11:27
  • And is there like switch so i can quick circle like in (google earth) between m*2 and Hektars? – Roby5 Oct 22 '18 at 11:28
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Use $area/10000 in the field calculator. Provided, your data is in any UTM CRS and available as a shape-file.

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