Comment 9 for bug 168344

firebird this bug is marked as a duplicate of another bug report, you should post there so we have it all in one place. If you only need support for using Inkscape you can try Answers section of this website ;)

Since Inkscape's default DPI is 90 (Inkscape's pixel is 1/90 of an inch), and the usual dpi is 72 you need a little math to get pt right.

If you need 10pt type, use 12.5 in Inkscape, so to get pt you want, use the points number, multiply with 1.25 and you get the Inkscape size.

This is equivalent to the post above that mentions editing svg source. If you don't want to calculate anything and use pt, select your text, go to Edit > XML editor (you'll get svg source for your text object), under Style attribute find where font-size is declared and change the number and unit to number and pt as the unit (for example from 10px to 10pt) and now hit Set button. As soon as you hit Set button you will see your entry in pt changed to the equivalent in px. You're done!