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":
George CROSS
(Abt 1860 Fremantle, Western Australia, Australia - 23 Jan 1929 Palmyra, Western Australia, Australia)
Anne GOGAN (19 Mar 1856 Toodyay, Western Australia, Australia - 14 Sep 1907 Fremantle, Western Australia, Australia)(m. 10 Jul 1879 Shark Bay, Western Australia, Australia)
Jessie POLAND (Abt 1895 Shark Bay, Western Australia, Australia - 1974 Geraldton, Western Australia, Australia)(m. 1918 Denham, Western Australia, Australia)
├─George Thomas CROSS (Denham, Western Australia, Australia;29 Nov 1916 - 26 Aug 1983)
└─Harry Clarence John CROSS (14 Jun 1920 Shark Bay, Western Australia, Australia - 27 Nov 1998 Geraldton, Western Australia, Australia)
Abt 1860 - 1929 (~ 69 years)
Anne GOGAN 
(19 Mar 1856 Toodyay, Western Australia, Australia -