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":
   │    │ Adriana Cornelia van Wichen (28 okt 1890 Zwammerdam - ??)(huw. 10 nov 1915 Gouda)
   │    │ :   ├─Jan Cornelis van der Harst (9 mei 1917 Vlaardingen - 27 feb 1979 Perth (Australia))
   │    │ :   │ Johanna Hendrika Wilhelmina van Thienen (9 jul 1926 Medan (Indonesia) -    │    │ :   │ 24 mei 1985 Perth (Australia))(huw. 21 jan 1946)
   │    │ :   │    ├─Ellen Dale van der Harst (17 jan 1947 's Gravenhage - 22 aug 2022 Perth)
   │    ├─Gustaaf Adolf van der Harst (18 dec 1894 Middelburg - 4 jan 1947 Amsterdam)
   │    │ Elisabeth Friedericke Johanna Maria Babetta Pütz (2 jan 1906 Köln (Duitsland) - ca. 1962)
   │    │ (huw. 27 jan 1932 Malang, Nederlands Indië)
   │    │    └─Gustaaf Adolf van der Harst (11 jun 1932 Malang (Nederlands Indië) -    │    │     9 sep 2003 Henderson, Clark, Nevada, USA)