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":
Margaret Mary CLEARY
(24 Sep 1864 Kilmore, Victoria, Australia - 17 Nov 1946 Grenfell, New South Wales, Australia)
John Robert FLINN (4 Sep 1854 Kilmore, Victoria, Australia - 17 Jun 1948 Grenfell, New South Wales, Australia)
(m. 17 Oct 1887 Grenfell, New South Wales, Australia)
└─Kathleen Ann FLINN (25 Jul 1906 Grenfell, New South Wales, Australia - 9 Mar 2001 Sydney, New South Wales, Australia)
Horace John SMYTH (12 Aug 1901 Young, New South Wales, Australia - 5 Sep 1962 Yagoona, New South Wales, Australia)(m. 1 Jul 1931)
Harold William FALK (21 Apr 1930 Albury, New South Wales, Australia - 7 Dec 2018 Sydney, New South Wales, Australia)(m. 8 Nov 1958 Bankstown, New South Wales, Australia)
1864 - 1946 (82 years)
John Robert FLINN 
(4 Sep 1854 Kilmore, Victoria, Australia - 17 Jun 1948 Grenfell, New South Wales, Australia)
