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":
Jopje Groen
( - Tue 7 May 1811 Egmond aan Zee (NL))
    Albert Leendertsz Blok (Egmond aan Zee (NL);Sun 22 Jul 1798 - Sun 10 Nov 1833)
    (m. Sun 1 Dec 1822 Egmond aan Zee (NL))
       ├─Adriana Blok (Egmond aan Zee (NL);Sun 28 Jan 1821 - Mon 24 Aug 1896)
       │ Maarten Stoker (Egmond aan Zee (NL);Sun 13 May 1821 - Tue 12 Jun 1906)
       │ (m. Sun 22 Jun 1845 Egmond aan Zee (NL))
       │    └─Aagje Stoker (Egmond aan Zee (NL);Wed 9 Apr 1856 - Sun 18 Feb 1940) =>
       │     + Jacob Zwart (Egmond aan Zee (NL);Wed 13 Feb 1861 - Mon 29 Jan 1940)
       ├─Neeltje Blok (Tue 3 Jun 1823 Egmond aan Zee (NL) - ??)
       │ Jan Wijker (Egmond aan Zee (NL);Fri 4 Aug 1815 - Thu 20 Feb 1868)
       │ (m. Sun 9 Jul 1848 Egmond aan Zee (NL))
       │    ├─Kniertje Wijker (Fri 17 Dec 1852 Egmond aan Zee (NL) - Thu 28 Oct 1915 Uitgeest (NL)) =>
       │    │ + Willem Vlottes (Fri 10 Apr 1846 uitgeest (NL) - ??)(m. Sun 27 May 1877 Schoorl (NL))
       │    └─Trijntje Wijker (Egmond aan Zee (NL);Thu 25 Oct 1860 - Tue 7 Sep 1948) =>
       │     + Dirk Groen (Sat 30 Sep 1865 Egmond aan Zee (NL) - ??)(m. Sat 12 Jan 1889 Egmond aan Zee (NL))
       ├─Leentje Blok (Egmond aan Zee (NL);Abt 1824 - Mon 11 Nov 1833)
       └─Leendert Blok (Egmond aan Zee (NL);Abt 1827 - Tue 12 Nov 1833)