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":
Neil MCKAY
(Abt 1863 Daylesford, Victoria, Australia - 20 Jun 1933 Goomalling, Western Australia, Australia)
Helen Agnes BRODIE (14 Feb 1861 Buninyong, Victoria, Australia - 28 Jul 1917 Northam, Western Australia, Australia)(m. 1883 Deniliquin, New South Wales, Australia)
└─Neil Francis Brodie MCKAY (Abt 1887 Lilydale, Victoria, Australia - 1968 Fremantle, Western Australia, Australia)
Elizabeth JOHNSTON (4 Sep 1893 Beverley, Western Australia, Australia - 18 Oct 1982 Wyalkatchem, Western Australia, Australia)
└─Neil Leslie MCKAY (Wyalkatchem, Western Australia, Australia;31 Dec 1916 - 28 Aug 2003)
Mary Muriel CHITTY (23 Jul 1916 Batbatting, Western Australia, Australia - 7 Oct 2009 Wyalkatchem, Western Australia, Australia)(m. 20 Jun 1942 Goomalling, Western Australia, Australia)
Abt 1863 - 1933 (~ 70 years)
Helen Agnes BRODIE 
(14 Feb 1861 Buninyong, Victoria, Australia -