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":
Thomas GRIEVE
(15 Dec 1862 Ipswich, Queensland, Australia - 11 Jul 1942 Brisbane, Queensland, Australia)
Elizabeth Annie BEGG (23 Nov 1880 Kelvin Grove, Queensland, Australia - 11 Oct 1968 Chelmer, Queensland, Australia)(m. 15 Sep 1910 Brisbane, Queensland, Australia)
└─Marie Enid GRIEVE (26 Oct 1918 Brisbane, Queensland, Australia - 31 Dec 1988 Fremantle, Western Australia, Australia)
Alan Jabe Bona DODD (14 Sep 1923 North Perth, Western Australia, Australia - 11 Sep 1996 Nedlands, Western Australia, Australia)(m. 22 Feb 1947 Claremont, Western Australia, Australia)
1862 - 1942 (79 years)
Elizabeth Annie BEGG 
(23 Nov 1880 Kelvin Grove, Queensland, Australia -