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":
Edwin Alexander BLACK
(12 Apr 1872 Grafton, New South Wales, Australia - 19 Oct 1952 Nedlands, Western Australia, Australia)
Lucy Ann MCLEAY (2 Jun 1871 Harwood Island, New South Wales, Australia - 4 Jun 1946 Nedlands, Western Australia, Australia)(m. 8 Aug 1894 Maclean, New South Wales, Australia)
└─Elsie Lavena BLACK (17 Dec 1900 Cottesloe, Western Australia, Australia - 19 Dec 1994 Bentley, Western Australia, Australia)
William Haining ROBERTSON (1899 Lockerbie, Dumfries-shire, Scotland - 28 Oct 1969 Gosnells, Western Australia, Australia)(m. 12 Apr 1930 Perth, Western Australia, Australia)
Elizabeth Evelyn JENKIN (7 Dec 1937 Geraldton, Western Australia, Australia - 8 Jan 2010 Rockingham, Western Australia, Australia)(m. 1958 Geraldton, Western Australia, Australia)
1872 - 1952 (80 years)
Lucy Ann MCLEAY 
(2 Jun 1871 Harwood Island, New South Wales, Australia -