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When creating point symbology with Esri software, we can use points, in, cm, or mm as a unit of measurement.

Due to the fact that there are a few definitions of a "pt" or point, which of the following definitions should be used?

  1. Didot point (0.376065 mm)
  2. Pica point (0.3514 mm)
  3. DTP point (0.3528 mm)
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  • For what it's worth, I've always heard the units referred to as points and picas - I've never heard 'pica point'. I'd also never heard of Didots either, but I don't study typography that much. The Wikipedia page (for whatever that's worth) notes that DTP has been established as "the de facto standard". – Chris W Jul 20 '15 at 21:13
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Point sizes are..

Points are a standard graphic measurement unit equal to 1/72 of and inch

or in metric 0.352778mm

So DTP point is the answer to your question.

http://resources.esri.com/help/9.3/arcgisdesktop/com/samples/Cartography/Labeling_and_Annotation/PointSizeCalculator/a2b8686d-673f-4954-92c8-8f2568125164.htm

This is a VBA Tool for calculating point sizes at set scales

Point Size at Map Scale Calculator http://resources.esri.com/help/9.3/arcgisdesktop/com/samples/Cartography/Labeling_and_Annotation/PointSizeCalculator/visual_basic/frmconversion.frm.htm

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