Given an 80-character soft-wrapping of a multi-paragraph scalar of English words in a monospace font ($content), what will the height of it be in characters ($rows)?

Wrap it yourself and count the lines: 

use Text::Wrap;
my $rows = split("\n", fill('','', $content););

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In reply to Re^3: Estimating height of TEXTAREA from content by simonm
in thread Estimating height of TEXTAREA from content by tomazos

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