See Re: Tk: Set text size in a widget and "perldoc Tk::Font" and "perldoc Tk::X11Font", but using the Canvas is always a good bet.
#!/usr/bin/perl
use warnings;
use strict;
use Tk;
my $mw = new MainWindow;
$mw->fontCreate('big',
-family=>'arial',
-weight=>'bold',
-size=> 28
);
my $c = $mw->Canvas(-bg=>'white')->pack;
#---determine font spacing by making a capital W---
my $fonttest = $c->createText(100,100,
-fill => 'black',
-text => 'W',
-font => 'big'
);
my ($bx,$by,$bx1,$by1) = $c->bbox($fonttest);
$c->{'f_width'} = $bx1 - $bx;
$c->{'f_height'} = $by1 - $by;
print 'width ',$c->{'f_width'},' ',$c->{'f_height'},"\n";
MainLoop;
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