The paper length is not relevant since the chart flows from one page to the next.
Mobile
in.
mm
Portrait
2.75
70
For smart phones, not for printing
Landscape
5.5
140
For smart phones, not for printing
USA & Canada
in.
mm
Letter Portrait
8.5
216
Also Legal Portrait
Letter Landscape
11
279
Legal Landscape
14
356
Also Ledger Portrait
Ledger Landscape
17
432
International
in.
mm
A5 Portrait
5.82
148
A4 Portrait
8.25
210
Also A5 Landscape
A4 Landscape
11.71
297
Also A3 Landscape
A3 Landscape
16.54
420
The Text+ programs assume that the right and left margins are each about 25mm (1/2 inch) wide.
On the Format for Printing page, differences in page margins can be accommodated by the "fudge factor":
Father: Jan Jobszn Wisboom (chr.Sun 17 Dec 1780 Neder Hardinxveld (NL) - Sun 18 Mar 1855 Giessendam (NL))
   │ Willempje de Kuijper (Sun 15 Nov 1846 Schelluinen (NL) - Wed 22 Sep 1880 Giessendam (NL))
   │ (m. Fri 31 Jan 1868 Schelluinen (NL))
   │    ├─Adrianus Hansum (Wed 18 Nov 1868 Giessendam (NL) - Mon 19 Oct 1953 Capelle aan de IJssel (NL))
   │    │ Eigje de Bruin (Thu 31 May 1866 Hoornaar (NL) - Sat 16 Dec 1933 Capelle aan de IJssel (NL))
   │    │ (m. Fri 05 Oct 1888 Schelluinen (NL))
   │    │    ├─Adrianus Hansum (Schelluinen (NL);Wed 12 Dec 1888 - Sun 18 Nov 1906)
   │    │    ├─Gerrit Hansum (Fri 06 Mar 1891 Schelluinen (NL) - Mon 10 Dec 1979 Capelle aan de IJssel (NL)) =>
   │    │    │ + Neeltje Romijn (Capelle aan de IJssel (NL);Mon 28 Jan 1895 - Tue 7 Oct 1980)
   │    │    │ (m. Wed 14 Oct 1914 Rotterdam (NL))
   │    │    ├─Willempje Hansum (Tue 20 Jun 1893 Vuren (NL) - Wed 5 Jan 1977 Rotterdam (NL)) =>
   │    │    │ + Leendert van Krimpen (Sat 19 May 1888 Zevenhuizen (NL) - Apr 1978 Capelle aan de IJssel (NL))
   │    │    │ (m. Thu 28 Mar 1918 Capelle aan de IJssel (NL))
   │    │    ├─Maria Hansum (Tue 12 Nov 1895 Vuren (NL) - Fri 13 May 1977 Capelle aan de IJssel (NL)) =>
   │    │    │ + Cornelis Willem Hartmans (Mon 31 Mar 1890 Fijnaart (NL) - Mon 25 Mar 1946 Rotterdam (NL))
   │    │    │ (m. Thu 26 Jul 1917 Capelle aan de IJssel (NL) )
   │    │    │ + Leendert van Loon (Abt 1899 Capelle aan de IJssel (NL) - ??)
   │    │    │ (m. Thu 31 Mar 1921 Capelle aan de IJssel (NL))