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":
Kate Elizabeth BLAKE
(17 Nov 1896 Grass Valley, Western Australia, Australia - 11 Apr 1969 Perth, Western Australia, Australia)
Charles Joseph BEARD (6 Jul 1890 Northam, Western Australia, Australia - 7 Sep 1933 Leederville, Western Australia, Australia)(m. 29 Apr 1914 Northam, Western Australia, Australia)
└─Sydney Joseph BEARD (15 Jun 1915 Northam, Western Australia, Australia - 12 Jul 1996 Fremantle, Western Australia, Australia)
Marjorie Nance SMITH (5 Feb 1917 East Victoria Park, Western Australia, Australia - 8 May 1989 Port Hedland, Western Australia, Australia)(m. 22 Dec 1951 Perth, Western Australia, Australia)
David John BIRNIE (16 Feb 1951 Subiaco, Western Australia, Australia - 7 Oct 2005 Casuarina, Western Australia, Australia)(m. 6 Sep 1974 Bunbury, Western Australia, Australia)
1896 - 1969 (72 years)
Charles Joseph BEARD 
(6 Jul 1890 Northam, Western Australia, Australia -