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":
Benjamin BARKER
(1883 Yea, Victoria, Australia - 23 Nov 1962 Perth, Western Australia, Australia)
Ruby Olive Beatrice HERBERT
(30 Aug 1895 Broken Hill, New South Wales, Australia - 29 Jun 1973 Perth, Western Australia, Australia)
└─Olive Lilian BARKER
(3 Apr 1922 Australia - 20 Nov 2010 Perth, Western Australia, Australia)
Harold James REYNOLDS
(21 Nov 1920 Australia - 15 Mar 1985 Perth, Western Australia, Australia)
├─Gail Ann REYNOLDS
(28 Jul 1949 Western Australia, Australia - 25 May 2016 Perth, Western Australia, Australia)
├─Gary Alan REYNOLDS
(Perth, Western Australia, Australia;17 Feb 1950 - 8 Sep 2009)
1883 - 1962 (79 years)
Ruby Olive Beatrice HERBERT 
(30 Aug 1895 Broken Hill, New South Wales, Australia - 29 Jun 1973 Perth, Western Australia, Australia)