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":
Jan de Vries
(Koog aan de Zaan (NL);Sun 24 Nov 1816 - Mon 2 Mar 1857)
   ├─Jan de Vries (Koog aan de Zaan (NL);Sat 24 Nov 1849 - Thu 18 May 1871)
   ├─Sara Marietje de Vries (Koog aan de Zaan (NL);Mon 23 Aug 1852 - Fri 31 Mar 1944)
   │ Jan Muis (Sun 14 Sep 1851 Koog aan de Zaan (NL) - Fri 18 Dec 1925 Zaandijk (NL))
   │ (m. Sun 9 May 1880 Koog aan de Zaan (NL))
   │    ├─Maria Muis (Mon 31 Oct 1881 Koog aan de Zaan (NL) - 1965)
   │    ├─Jan Muijs (Sun 23 Sep 1883 Koog aan de Zaan (NL) - 1961 Cambridge, MA (USA))