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":
James JOYCE
(14 Nov 1896 Dewsbury, Yorkshire, England - 31 Aug 1977 Midland, Western Australia, Australia)
Florence Annie BEATTIE
(Sep 1900 Newcastle Upon Tyne, Northumberland, England - Jan 1955 Midland, Western Australia, Australia)
└─Doreen JOYCE
(10 Jun 1924 England - Aug 1980 Greenmount, Western Australia, Australia)
Thomas Henry HIGGINS
(1922 - 7 May 2006 Guildford, Western Australia, Australia)
(m. 1942 Swan, Western Australia, Australia)
└─Allan Albert HIGGINS
(Apr 1944 - 5 Sep 2005 Leschenault, Western Australia, Australia)
1896 - 1977 (80 years)
Florence Annie BEATTIE 
(Sep 1900 Newcastle Upon Tyne, Northumberland, England -