The paper length is not relevant since the chart flows from one page to the next.
Mobile
in.
mm
Portrait
2.75
70
For smart phones, not for printing
Landscape
5.5
140
For smart phones, not for printing
USA & Canada
in.
mm
Letter Portrait
8.5
216
Also Legal Portrait
Letter Landscape
11
279
Legal Landscape
14
356
Also Ledger Portrait
Ledger Landscape
17
432
International
in.
mm
A5 Portrait
5.82
148
A4 Portrait
8.25
210
Also A5 Landscape
A4 Landscape
11.71
297
Also A3 Landscape
A3 Landscape
16.54
420
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":
Father: Jean Nicolaas Croes (Hoogstraten (B);Sat 25 Jun 1746 - Mon 16 Mar 1835)
   ├─Joannes Baptista Peeters (Mon 22 May 1815 Brecht (B) - Sat 24 Mar 1883 Brasschaat (B))
   │ + Anna Catharina van Geel (Thu 15 Aug 1816 Ekeren (B) - Sat 27 Feb 1886 Brasschaat (B))
   │ (m. Tue 21 May 1844 Brecht (B))