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":
   │    ├─Mattheus Johannes Agelink van Rentergem (9 feb 1839 Middelburg -    │    │ 11 nov 1859 aan boord van Z.M. schroefstoomschip Reinier Claiszen)
   │    │    │    ├─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)
   │    │    │    ├─Maria van der Harst (22 okt 1897 Middelburg - 10 feb 1971 Rotterdam) =>
   │    │    │    │ + Lambertus Frederik Jansen (15 jun 1896 Rotterdam - 8 feb 1979 Poortugaal)
   │    │    │    │ (huw. 28 feb 1922 Middelburg)
   │    │    │    └─Johanna Cornelia van der Harst (29 nov 1902 Middelburg - 31 mei 1991 's Gravenhage)
   │    │    │     + Charles Louis van Weijnsbergen (9 jan 1905 Terneuzen - 30 jan 1990 's Gravenhage)
   │    │    ├─Johannes Peters (23 aug 1868 Serooskerke - 15 jan 1940 Terneuzen)