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":
Lucy K FITZGERALD
(26 Aug 1887 Bowral, New South Wales, Australia - 26 Apr 1948 Redfern, New South Wales, Australia)
Thomas Elijah MATHEWS (10 Jun 1884 Tempe, New South Wales, Australia - May 1961 Sydney, New South Wales, Australia)(m. 14 Jun 1910 Sydney, New South Wales, Australia)
└─Thomas Henry Charles MATHEWS (1905 Sydney, New South Wales, Australia - 1960 East Coolgardie, Western Australia, Australia)
Rita Elizabeth PINK (5 Jun 1904 Fremantle, Western Australia, Australia - 25 Mar 1983 Subiaco, Western Australia, Australia)
└─Maureen MATTHEWS (Belmont, Western Australia, Australia;12 Jun 1938 - 1 Sep 2022)
1887 - 1948 (60 years)
Thomas Elijah MATHEWS 
(10 Jun 1884 Tempe, New South Wales, Australia -