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":
│ ├─Nora Adelaide WARD (1910 St Kilda, Victoria, Australia - 1990 Melbourne, Victoria, Australia)
│ └─Paul Richard WARD (1911 Melbourne, Victoria, Australia - 1984 Western Australia, Australia)
│ Grace Doreen BUCKINGHAM (16 May 1914 Kelmscott, Western Australia, Australia - │ 2 Mar 1993 Brookton, Western Australia, Australia)(m. 1936 Beverley, Western Australia, Australia)
│ ├─Robert John WARD (Beverley, Western Australia, Australia;12 Oct 1937 - 29 Nov 1984)
Mary STEEN (1880 - DECEASED)(m. 1900 Boulder, Western Australia, Australia)
└─George Edgar LUPTON (11 Aug 1913 - 15 Jun 1988 Narrogin, Western Australia, Australia)
Amy Adelaide Fraser KILPATRICK (1911 Western Australia, Australia - 8 Feb 1999 Narrogin, Western Australia, Australia)(m. 1939 Beverley, Western Australia, Australia)
Abt 1825 - 1891 (~ 66 years)
Grace Doreen BUCKINGHAM 
(16 May 1914 Kelmscott, Western Australia, Australia -