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":
Charles DENHAM
(7 Sep 1885 St Arnaud, Victoria, Australia - 27 Nov 1959 Harvey, Western Australia, Australia)
Ivy Emily Edith BROWN (23 Oct 1894 Echuca, Victoria, Australia - 26 Jun 1957 Doubleview, Western Australia, Australia)(m. 27 Jun 1911 Perth, Western Australia, Australia)
└─Ivy Harriet Stewart DENHAM (3 Dec 1911 Holyoake, Western Australia, Australia - 24 May 1996 Kallaroo, Western Australia, Australia)
Ronald Leslie ELSEGOOD (27 Jan 1912 Beverley, Western Australia, Australia - 19 Jan 1991 Wembley, Western Australia, Australia)(m. 1934 Perth, Western Australia, Australia)
1885 - 1959 (74 years)
Ivy Emily Edith BROWN 
(23 Oct 1894 Echuca, Victoria, Australia -