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 Isa Klok (4 jan 1917 Rockanje - 5 sep 2004 Alphen aan de Rijn)
       │    │    ├─Leendert Dinardus Klok (17 dec 1917 Oostvoorne - 20 jun 2011 Rotterdam) =>
       │    │    │ + Johanna Jacoba Jansen (Rotterdam;23 jan 1925 - 23 mei 2014)(huw. 15 aug 1946 Rotterdam)
       │    │    ├─Dina Geertje Jasprina Klok (17 aug 1919 Oostvoorne - 10 feb 1978 Rockanje)
       │    │    └─Willy Cornelia Klok (24 jun 1928 Rockanje - 12 dec 1970 Rotterdam)
       │    ├─Geertje Jasprina Klok (Rockanje;15 dec 1894 - 8 jun 1982)
       │    │ + Izaäk Arie Klok (13 jan 1886 Oostvoorne - 22 okt 1970 Rockanje)(huw. 15 mei 1919 Rockanje)