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":
William HALL
(1833 Warwickshire, England - 28 Apr 1892 Kangaroo Flat, Victoria, Australia)
Catharine TAPRELL (16 Jul 1849 Adelaide, South Australia, Australia - 7 Mar 1934 Perth, Western Australia, Australia)(m. 11 Mar 1872 Melbourne, Victoria, Australia)
└─Frederick HALL (6 Nov 1883 Bendigo, Victoria, Australia - 27 Jul 1969 Perth, Western Australia, Australia)
Sarah May REDPATH (1886 Gawler, South Australia, Australia - 6 Feb 1951)(m. 10 Apr 1907)
└─William Taprell HALL (1911 Day Dawn, Western Australia, Australia - 15 Mar 1981 Dalkeith, Western Australia, Australia)
Marjorie Mavis NAYLOR (2 Feb 1922 Western Australia, Australia - 16 Jun 2007 Albany, Western Australia, Australia)
1833 - 1892 (59 years)
Catharine TAPRELL 
(16 Jul 1849 Adelaide, South Australia, Australia -