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: Johannes Achenbach (ged.27 feb 1631 Siegen (Deutschland) - 29 jul 1691 Ferndorf (Deutschland))
            Hermanus Hendrik van Boeckholt (ged.10 sep 1788 Gorinchem - 24 feb 1876 Brouwershaven)
            (huw. 9 jun 1819 Den Haag)
               ├─Hendrik David van Boeckholt (19 apr 1820 Delfzijl - 2 jul 1868 Delft) =>
               │ + Johanna Frederica Mondeeren (21 nov 1829 Vlissingen - 17 mrt 1852 Batavia)
               │ : (huw. 16 nov 1850 Batavia)