The paper length is not relevant since the chart flows from one page to the next.
Mobile
in.
mm
Staand
2.75
70
For smart phones, not for printing
Liggend
5.5
140
For smart phones, not for printing
International
in.
mm
A5 Staand
5.82
148
A4 Staand
8.25
210
Also A5 Liggend
A4 Liggend
11.71
297
Also A3 Liggend
A3 Liggend
16.54
420
USA & Canada
in.
mm
Letter Staand
8.5
216
Also Legal Staand
Letter Liggend
11
279
Legal Liggend
14
356
Also Ledger Staand
Ledger Liggend
17
432
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":
Vader: Jan van Bochove (ged.25 apr 1779 Waddinxveen - 25 sep 1827 Rotterdam)
   │    ├─Cornelia Jansen (Rotterdam;10 jan 1865 - 28 mrt 1938)
   │    │ + François Theodor Peuchen (21 aug 1861 Batusangkar, Tanah Datar, West Sumatra, Indonesië -    │    │ 31 dec 1914 Rotterdam)(huw. 27 aug 1908 Rotterdam)
   │    │ Henriette Louise van Boeckholt (22 feb 1863 Toboali (Ned. NO Indië) - 30 aug 1949 Schiedam)
   │    │ (huw. 3 nov 1892 Rotterdam)
   │    │    ├─Johan Willem Nicolaas Jansen (Rotterdam;6 aug 1893 - 9 feb 1976)
   │    │    │ Aaltje Kleijn (Rotterdam;24 mei 1904 - 22 feb 1985)(huw. 2 nov 1927 Hilligersberg)
   │    │    │    ├─Jacobus Carolus Jansen (Rotterdam;10 aug 1928 - 28 jun 1996) =>
   │    │    │    │ + Margaretha Wilhelmina Liduina van Pelt (Schiedam;25 jun 1927 - 23 jan 2023)
   │    │    │    │ (huw. 31 mei 1951 Schiedam)
   │    │    ├─Lambertus Frederik Jansen (15 jun 1896 Rotterdam - 8 feb 1979 Poortugaal)
   │    │    │ Maria van der Harst (22 okt 1897 Middelburg - 10 feb 1971 Rotterdam)
   │    │    │ (huw. 28 feb 1922 Middelburg)
   │    │    │    ├─Johanna Jacoba Jansen (Rotterdam;23 jan 1925 - 23 mei 2014) =>
   │    │    │    │ + Leendert Dinardus Klok (17 dec 1917 Rockanje - 20 jun 2011 Rotterdam)
   │    │    │    │ (huw. 15 aug 1946 Rotterdam)
   │    │    │    └─Henriette Louise Jansen (Rotterdam;7 apr 1927 - 16 aug 2014) =>
   │    │    │     + Hendricus van den Heuvel (Rotterdam;16 aug 1926 - 29 jan 2022)(huw. 22 okt 1952 Rotterdam)