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: Simon Pieterszn Hansum (chr.Sun 12 Oct 1749 Neder Hardinxveld (NL) - Tue 21 Apr 1835 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))
   │ + Jan Lourenszn de Groot (Abt 1802 Asperen (NL) - Sat 27 Aug 1859 Giessendam (NL))
   │ (m. Thu 16 Mar 1837 Giessendam (NL))
   ├─Pietertje Hansum (Wed 04 Oct 1815 Giessendam (NL) - Fri 19 Jun 1891 Hardinxveld (NL))
   │ + Bastiaan Langeveld (Hardinxveld (NL);Sat 28 Feb 1818 - Mon 25 Mar 1895)(m. Thu 01 Nov 1849 Hardinxveld (NL))