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":
       │    │ Henricus van den Heuvel (18 jun 1824 Schiedam - 14 mei 1866 Rotterdam)
       │    │ : (huw. 17 nov 1847 Rotterdam)
       │    │ :   ├─Maria van den Heuvel (Rotterdam;23 mrt 1848 - 19 nov 1850)
       │    │ :   ├─Johannes Roelof van den Heuvel (Rotterdam;20 mei 1850 - 23 feb 1890) =>
       │    │ :   ├─Hendricus van den Heuvel (Rotterdam;5 feb 1859 - 18 nov 1936) =>
       │    │ :   │ + Adriana Elizabeth van Kalken (Rotterdam;2 mei 1861 - 28 aug 1941)
       │    │ :   │ (huw. 16 nov 1881 Rotterdam)
       │    │ :   ├─Dorothea van den Heuvel (Rotterdam;14 feb 1861 - 28 dec 1862)
       │    │ :   └─Dorothea van den Heuvel (Rotterdam;18 jul 1866 - 25 apr 1868)