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":
   │ + Eugène Thiery (Fri 22 May 1891 Mont Saint Martin (FR) - Fri 20 Apr 1979 Brasschaat (B))
   │ (m. Sat 22 Dec 1923 Borgerhout (B))
   ├─Franciscus Croes (Mon 6 Jan 1896 Antwerpen (B) - Tue 5 Nov 1957 Borgerhout (B))
   │ Ida Philomene Edmond Stijnen (Sun 1 Jan 1899 Antwerpen (B) - ??)(m. Sat 13 Jul 1918 Antwerpen (B))
   │    └─Egied Frans Clement Croes (Sun 8 Jun 1919 Antwerpen (B) - Tue 6 Dec 1994 bur.Deurne (B))
   │     Maria Tyssen / Thyssen (Wed 17 Dec 1919 Antwerpen (B) - Sun 27 Mar 2011 Deurne (B))