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":
Rosanna PATERSON
(28 May 1867 Brisbane, Queensland, Australia - 19 Jul 1937)
Robert Thomas LONG (30 Apr 1876 Ballarat, Victoria, Australia - 18 Aug 1919 Leederville, Western Australia, Australia)
└─Florence Rose LONG (Perth, Western Australia, Australia;10 Sep 1900 - 16 Jun 1980)
Sydney Francis NEWMAN (28 Jun 1898 Denmark, Western Australia, Australia - 9 Dec 1981 Leederville, Western Australia, Australia)
└─Rose Evelyn NEWMAN (29 Jul 1930 Southern Cross, Western Australia, Australia - 18 Sep 2003 Adelaide, South Australia, Australia)
Kenneth Robert BRADY (13 Feb 1925 Northam, Western Australia, Australia - 2 Oct 1988 Modbury, South Australia, Australia)(m. 1956 Perth, Western Australia, Australia)
1867 - 1937 (70 years)
Robert Thomas LONG 
(30 Apr 1876 Ballarat, Victoria, Australia -