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":
Ivy WEBB
(23 Oct 1896 Candelo, New South Wales, Australia - 23 Jan 1979 Eastern Creek, New South Wales, Australia)
Robert Arthur MURDOCH (28 Jul 1892 Corowa, New South Wales, Australia - 29 Jan 1966 Blacktown, New South Wales, Australia)(m. 22 Aug 1916 Sydney, New South Wales, Australia)
└─Yvonne Valda MURDOCH (12 Sep 1931 Rylstone, New South Wales, Australia - 26 Mar 2018 Westmead, New South Wales, Australia)
Thomas Arthur GRAYHURST (10 Nov 1928 Kogarah, New South Wales, Australia - 25 Dec 2010 Sydney, New South Wales, Australia)(m. 10 Nov 1951)
1896 - 1979 (82 years)
Robert Arthur MURDOCH 
(28 Jul 1892 Corowa, New South Wales, Australia -