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":
       │    │    ├─Johanna Jacoba Wilhelmina van der Harst (16 mei 1859 Middelburg - 31 mrt 1934 Vlissingen)
       │    │    ├─Willem Adriaan van der Harst (Middelburg;25 nov 1862 - 30 mei 1940)
       │    │    ├─Francois Cornelis van der Harst (Middelburg;8 jun 1865 - 15 mrt 1866)
       │    │    ├─Francois Cornelis van der Harst (3 jun 1868 Middelburg - 25 jul 1932 Bergen op Zoom)
       │    │    ├─Johanna Maria van der Harst (Middelburg;18 aug 1870 - 8 nov 1940)
       │    │    ├─N.n. van der Harst (Middelburg;10 dec 1872 - 10 dec 1872)
       │    │    ├─Willemina Josina van der Harst (Middelburg;6 jun 1874 - 11 aug 1874)
       │    │    └─Johannes Jacobus van der Harst (8 aug 1876 Middelburg - 25 jan 1957 Vlissingen)