Using ArcGIS 10.2, I've put together a Model Builder model that counts the number of wind turbines in a buffer zone:

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When I'm done, I can see how many turbines have been selected at the bottom of the attribute table panel like this:

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How can I use Model Builder to capture this output (e.g., the number of turbines "1040") and save it to an existing (empty) field in my attribute table?

  • @Luke: I just clarified in the questions text per your request. I'd like to write the numerical value "1040" to an existing field in a shapefile attributed table.
    – Nick Cain
    Commented May 20, 2015 at 1:47
  • 1
    Not so much.. there is a GetCount tool resources.arcgis.com/en/help/main/10.1/index.html#//… which you could probably hack into a field calculation. You could do this easily in python, add it to a custom toolbox then incorporate that into your model... would that help? Commented May 20, 2015 at 2:33

1 Answer 1


Use the Get Count and Calculate Field tools. Make sure the output of Get Count is a precondition for Calculate Field. The output of Get Count is passed to Calculate Field via in-line variable substitution.

E.g. enter image description here

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