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":
Frances Sophia ANDERSON
(4 Mar 1869 Tambaroora, New South Wales, Australia - 4 Oct 1943 Sydney, New South Wales, Australia)
Robert COOMBS
(1 Sep 1868 Tambaroora, New South Wales, Australia - 14 Jan 1946 Wollongong, New South Wales, Australia)
└─Elizabeth Marie COOMBS
(15 Jun 1907 Cobar, New South Wales, Australia - 18 Jan 1977 Bondi, New South Wales, Australia)
James William KELLY
(20 Nov 1903 Wallacetown, Victoria, Australia - 29 Aug 1960 Bondi, New South Wales, Australia)
└─James Robert KELLY
(Sydney, New South Wales, Australia;25 May 1928 - 15 May 2015)
Audrey Nola MOYLE
(Sydney, New South Wales, Australia;24 Sep 1931 - 20 Nov 2007)
1869 - 1943 (74 years)
Robert COOMBS 
(1 Sep 1868 Tambaroora, New South Wales, Australia - 14 Jan 1946 Wollongong, New South Wales, Australia)