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: Henricus van Alphen (ged.26 sep 1701 Gemert - begr.14 mei 1781 Geertruidenberg)
Moeder: Anna Maria Weijts (ged.2 feb 1713 Gemert - begr.26 jun 1748 Geertruidenberg)
    :       │ Jan van Kalken (10 jul 1834 Baarn - 29 jul 1911 Rotterdam)(huw. 6 jul 1859 Rotterdam)
    :       │    ├─Johanna Cornelia van Kalken (Rotterdam;1 aug 1859 - 1 apr 1935)
    :       │    ├─Adriana Elizabeth van Kalken (Rotterdam;2 mei 1861 - 28 aug 1941) =>
    :       │    │ + Hendricus van den Heuvel (Rotterdam;5 feb 1859 - 18 nov 1936)(huw. 16 nov 1881 Rotterdam)