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":
Meinsje Blaauw
(30 mei 1805 Zunderdorp (NL) - Bef 10 Aug 1873)
Cornelis Kleijn (Fri 7 Oct 1803 Durgerdam (NL) - Thu 2 Jul 1846 Zuiderzee (NL))(m. Sun 17 May 1835 Ransdorp (NL))
   ├─Eldert Kleijn (Thu 25 May 1837 Landsmeer (NL) - ??)
   │ Elisabeth Pet (Fri 22 Jun 1838 Buiksloot (NL) - ??)(m. Thu 14 May 1863 Nieuwendam (NL))
   │    │ + Henri Pierre Benoit Antoine op 't Eijnde (1868 Lochem (NL) - Thu 5 Nov 1959 Rotterdam (NL))
   │    │ (m. Wed 30 Nov 1910 Hilversum (NL))
   │    ├─Cornelia Kleijn (Fri 5 May 1882 Nieuwer-Amstel (NL) - Thu 8 Jan 1885 Nieuwendam (NL))