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":
Thomas Henry CROSS
(2 Nov 1882 Heywood, Victoria, Australia - 29 Oct 1964 Subiaco, Western Australia, Australia)
Mary SULLIVAN (5 Sep 1882 Albany, Western Australia, Australia - 4 Mar 1953 Kalgoorlie, Western Australia, Australia)(m. 6 Jan 1906 Collie, Western Australia, Australia)
└─George Hastings CROSS (30 Jun 1918 Subiaco, Western Australia, Australia - 18 Apr 1999 Perth, Western Australia, Australia)
Mena Kathleen CODY (Perth, Western Australia, Australia;18 Jan 1916 - 4 Oct 1991)
└─Lynette CROSS (13 Feb 1941 Subiaco, Western Australia, Australia - 12 Jan 2016 Mandurah, Western Australia, Australia)
Henry MORGAN (6 Oct 1940 - DECEASED Queensland, Australia)
1882 - 1964 (81 years)
Mary SULLIVAN 
(5 Sep 1882 Albany, Western Australia, Australia -