The row height you experience WHEN the row height is automatic will be impacted by:
1. Paragraph height (font size, font name, space before, space after, paragraph height setting)
2. Table border thickness
3. Table cell top and bottom padding

The fact that changing the typeface (font name) in an auto height row makes a very significant change to the row height gives an indication that it is a complete waste of valuable time to try to calculate exactly how tall that row is.

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Andrew Lockton
Chrysalis Design, Melbourne Australia