I have a column in a large attribute table. The values in this column are numeric value.

Example entries in this case would be:

1, 2.0512, 8.5744, 8.944

How can I add the word 'm' to the end of each entry so it'd look like:

1m, 2.0512m, 8.5744m, 8.944m

I don't want to use the technique of sorting them, then selecting them, then using field calculator to define them. I just want to know how to add text at the end of existing value, no matter what the existing value is.

  • This is in ArcGIS in case they are similar: Using Field Calculator, the expression would be something along the lines of str(!fieldname!) + 'm'. The general idea is that you need to convert the numeric value to string and then concatenate with another string.
    – SMiller
    Commented Aug 6, 2018 at 15:58
  • 2
    Based on this thread gis.stackexchange.com/questions/229786/… it looks like the function in QGIS to convert a number to string is to_string rather than the Python str. But maybe it doesn't have an underscore, per the qgis documentation (look in conversions group) -- docs.qgis.org/2.8/en/docs/user_manual/working_with_vector/…
    – SMiller
    Commented Aug 6, 2018 at 16:00

1 Answer 1


If your original field is a string-type field, you can update it instead of creating a new field.

Use the Field Calculator to update an existing field

  • Check the box next to "Update existing field"
  • Select "oldfield" from the dropdown menu
  • Use this expression* concat("oldfield", 'm')

enter image description here

If your original field type is numerical, you can't add text to it. Instead you have to add a new string-type field.

Use the Field Calculator to create a new field.

  • Output field type: text(string)
  • Use this expression* concat("oldfield", 'm')

enter image description here

*Substitute the actual name of your field where I used the value "oldfield"

  • 1
    May work as well "Field_with_values" || 'm'
    – Taras
    Commented Feb 19, 2019 at 12:31

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