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":
Mary Susan GILLISPIE
(17 Aug 1849 Lancaster, Fairfield, Ohio, USA - 9 Feb 1918 Columbus, Franklin, Ohio, USA)
John Ebbert ADAMS
(26 May 1842 Berwick, Columbia, Pennsylvania, USA - 25 Dec 1901 Columbus, Franklin, Ohio, USA)
└─Edith Olive ADAMS
(Columbus, Franklin, Ohio, USA;4 Aug 1889 - 23 Oct 1957)
Jasper Meckel MEAD
(16 Mar 1888 Ohio, USA - 28 Jan 1959 Columbus, Franklin, Ohio, USA)
└─Anne Olive MEAD
(15 Dec 1921 Grandview Heights, Franklin, Ohio, USA - 8 Jun 2002 Granite Bay, Placer, California, USA)
Jack Lester DEETS
(22 Jun 1917 Riverdale, Buffalo, Nebraska, USA - 19 Oct 2002 Loomis, Placer, California, USA)(m. 3 Feb 1945 Lockbourne, Pickaway, Ohio, USA)
1849 - 1918 (68 years)
John Ebbert ADAMS 
(26 May 1842 Berwick, Columbia, Pennsylvania, USA -