Counting number of selected features in QGIS

Question

I have performed a selection by expression (Attribute table) on a layer that contains thousands of features. I would like to know the number of features in this selection.

Answer 1

Look at the header of the attribute table, it tells you the total number of objects in tables, as well as the filtered and selected ones.

Answer 2

This works fine for me:

from qgis.core import *
import qgis.utils

layer = iface.activeLayer()        
features = layer.selectedFeatures() 
print ("Total count", layer.featureCount())
print ("Selected features count:", len(features))

Answer 3

There are several methods that I may refer you to:

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1. Press Shift + F6 to open attribute table with selected features only. There will be two values that represent the number of selected features: 'Filtered' and 'Selected'.

You can also see the 'Selected' when simply opening the attribute table with F6. As was answered by @Pierre Vivet.

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2. In the left bottom corner there will be a description of selected features.

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3. Similar to @Nenad Stojanovic answer, however, it is based just on one method called selectedFeatureCount():

layer = iface.activeLayer()

print("Selected features count: ", layer.selectedFeatureCount())

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4. Via opening the Field Calculator and using either num_selected() or num_selected(@layer) expression in the Expression dialogue. It is based on the num_selected() function.

Returns the number of selected features on a given layer. By default works on the layer on which the expression is evaluated.

Also can be achieved with this expression count(1, group_by:=is_selected()), based on the is_selected() function.

Returns True if a feature is selected. Can be used with zero, one or two arguments, see below for details.

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5. Also by means of the "Show statistical summary". Symbolized as a Sigma symbol(), placed in the main QGIS working window.

In the appearing window, you just need to choose the layer in which you are interested and choose a random field and tick the 'Selected feature only'. The total number of selected features will be represented in the row called 'Count'.

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References:

• DefKey | QGIS 3.10 keyboard shortcuts