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":
Georgina LANCASTER
(8 Jul 1878 Alexandra, Victoria, Australia - 30 Mar 1960 East Victoria Park, Western Australia, Australia)
Garret Thomas FITZGERALD (1 Jan 1865 Port Gawler, South Australia, Australia - 21 Apr 1943 Perth, Western Australia, Australia)(m. 26 Nov 1900 Denmark, Western Australia, Australia)
└─Roy Francis FITZGERALD (21 Aug 1908 Denmark, Western Australia, Australia - 21 May 1992 Gosnells, Western Australia, Australia)
Violet Elizabeth Laura TONDUT (21 Jun 1910 Perth, Western Australia, Australia - 13 May 1975 Gosnells, Western Australia, Australia)(m. 7 Sep 1929 Perth, Western Australia, Australia)
1878 - 1960 (81 years)
Garret Thomas FITZGERALD 
(1 Jan 1865 Port Gawler, South Australia, Australia -