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":
   ├─Mensje Kleijn (Mon 8 Jan 1877 Velsen (NL) - ??)
   │ + Jan Starink (1870 Zeist (NL) - ??)(m. Thu 11 Nov 1897 Zeist (NL))
   ├─Dirk Kleijn (Fri 16 Aug 1878 Velsen (NL) - Fri 17 Mar 1899 Arnhem (NL))
   ├─Elisabeth Kleijn (Sat 28 Aug 1880 Nieuwer-Amstel (NL) - ??)
   │ + Henri Pierre Benoit Antoine op 't Eijnde (1868 Lochem (NL) - Thu 5 Nov 1959 Rotterdam (NL))
   │ (m. Wed 30 Nov 1910 Hilversum (NL))
   ├─Cornelia Kleijn (Fri 5 May 1882 Nieuwer-Amstel (NL) - Thu 8 Jan 1885 Nieuwendam (NL))
   ├─Cornelis Kleijn (Sat 20 Dec 1884 Nieuwer-Amstel (NL) - ??)
   │ Aaltje Rengelink (De Wijk (NL);Tue 19 Jan 1892 - Sat 14 Oct 1939)(m. Sat 27 Jan 1923 De Wijk (NL))
   │    └─Aaltje Maria Kleijn (Fri 10 Dec 1926 Meppel (NL) - ??)
   │     + Johannes Hendrik Martens (Tue 18 Mar 1930 Meppel (NL) - ??)(m. Tue 9 Apr 1957 Meppel (NL))
   └─Jelle Kleijn (Nieuwer-Amstel (NL);Sat 9 Jul 1887 - Sun 16 Oct 1887)