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":
   │    │    │ :   ├─Cornelia Susanna Jansen (Rotterdam;22 jun 1886 - 2 aug 1886)
   │    │    │ :   ├─Josephina Johanna Elisabeth Jansen (11 dec 1889 Rotterdam - 24 aug 1977 Kampen) =>
   │    │    │ :   │ + Antoon Cornelis van Brink (13 feb 1890 Breda - 9 dec 1950 Nieuw Ginneken)
   │    │    │ :   │ (huw. 10 aug 1914 Breda)
   │    │    │ :   ├─Johan Willem Nicolaas Jansen (1 apr 1897 Utrecht - 2 dec 1961 's Gravenhage) =>
   │    │    │ :   │ + Anna Ewoudina van Rhee ('s Gravenhage;4 apr 1901 - 4 sep 1980)(huw. 30 aug 1933 Rijswijk)
   │    │    │ + François Theodor Peuchen (21 aug 1861 Batusangkar, Tanah Datar, West Sumatra, Indonesië -    │    │    │ 31 dec 1914 Rotterdam)(huw. 27 aug 1908 Rotterdam)
   │    │    ├─Johan Willem Nicolaas Jansen (19 jan 1867 Rotterdam - 28 nov 1960 Zeist)
   │    │    │ + Pieternella Silvius (2 jun 1873 Ridderkerk - 21 okt 1963 Zeist)(huw. 20 dec 1900 Ridderkerk)
   │    │    │ 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)
   │    │    │    ├─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)