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":
Augustus Judson Byars
(19 Nov 1877 Orangeville, Montague County, Texas, USA - 10 Apr 1967 Fort Sumner, De Baca County, New Mexico, USA)
Mary Willie Cooper
(9 Feb 1880 Orangeville, Montague County, Texas, USA - 18 Jun 1971 Fort Sumner, De Baca County, New Mexico, USA)
         ├─Sidney Augustus Byars
(25 Sep 1903 Dodson, Quay County, New Mexico, USA - 10 Jun 1937 Fort Sumner, De Baca County, New Mexico, USA)
         ├─Viola Beatrice Byars
(10 Jun 1905 Dodson, Quay County, New Mexico, USA - Jun 1978 Tucumcari, Quay County, New Mexico, USA)
         │ Jacques Gabriel Plantier
(9 Jun 1906 France - 25 Sep 1993 Amarillo, Potter County, Texas, USA)
         │ :         └─Daryl Spencer Plantier
(1 Oct 1937 Safford, Graham County, Arizona, USA - 27 Feb 2003 Lubbock, Lubbock County, Texas, USA)
         │ :          Sondra Kay Gleason
(10 Sep 1939 El Dorado, Butler County, Kansas, USA - 29 Jun 2007 Dover, Kent County, Delaware, USA)
         │ :                    + Living
         │ + Barton Ramsey
(1905 Texas, USA - ??)
         ├─Anne Leatus Byars
(13 Jul 1910 Tucumcari, Quay County, New Mexico, USA - 24 Nov 2002 Albuquerque, Bernalillo County, New Mexico, USA)
         │ + Travis Milton Coburn
(14 Aug 1908 Hamilton, Hamilton County, Texas, USA - 22 Feb 1995 Estancia, Torrance County, New Mexico, USA)
         ├─Louellen Byars
(Abt 1922 New Mexico, USA - ??)
         ├─Margaret M. West
(6 Jan 1913 Quay County, New Mexico, United States of America -          │ 10 Jan 2008 Slaton, Lubbock County, Texas, United States of America)
         └─Gus L Byars
(20 Nov 1914 Dodson, Quay County, New Mexico, USA - 26 May 2005 Portales, Roosevelt County, New Mexico, USA)