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":
Elizabeth Maria ALLEN
(Sep 1897 Holborn, Middlesex, England - 14 Jul 1976 Subiaco, Western Australia, Australia)
William Walter WISHART (7 Jul 1894 Korumburra, Victoria, Australia - 13 Dec 1961 Willagee, Western Australia, Australia)(m. 1916 East Coolgardie, Western Australia, Australia)
└─Norman Leslie WISHART (22 Nov 1919 Boulder, Western Australia, Australia - 14 Apr 1989 Nedlands, Western Australia, Australia)
Elizabeth Joan ASSAN (1 Sep 1925 Palmyra, Western Australia, Australia - 9 Aug 1971 Willagee, Western Australia, Australia)(m. 9 Feb 1951 Fremantle, Western Australia, Australia)
1897 - 1976 (~ 78 years)
William Walter WISHART 
(7 Jul 1894 Korumburra, Victoria, Australia -