QGIS – Summing Values in a Field for Selected Features

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I'm a new user trying to perform very simple operation but I'm completely stuck. I'd like to be able to select a number of features on the map and then get the sum of a particular field for only the selected features, on the fly. For example, summing the population fields for a number of counties that I've selected on the map. I don't need to store the sum in any way, I just need to quickly get it for reference.

Best Answer

The Statistics Panel displays various calculations based on a field.

  • To open the Statistics Panel, click the epsilon button in the Attributes toolbar.
  • Select the layer from the dropdown menu at the top of the stats panel.
  • Select the field from the dropdown menu below that.
  • At the bottom of the panel, check the box for "selected features only." Otherwise statistics are calculated for all features in the layer.
  • To choose what types of stats are calculated, use the "..." button at the bottom-right of the panel.

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Screenshot is from QGIS 2.18. The stats panel also exists in QGIS 3.0.

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