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":
Andrew Alexander Arbuckle
(16 Jun 1847 Accomack County, Virginia, USA - 23 Sep 1936 Howard County, Missouri, USA)
         ├─Estelle Mahele Arbuckle
(5 Apr 1872 Kentucky, USA - 6 Sep 1961 University Park, Dallas County, Texas, USA)
         │ + Walter Keene Parker
(Feb 1872 Quincy, Adams County, Illinois, USA - 8 Aug 1948 Dallas County, Texas, USA)
         ├─Ann Maud Arbuckle
(18 Feb 1883 Estill, Howard County, Missouri, USA - 10 Dec 1971 Midwest City, Oklahoma County, Oklahoma, USA)
         │ + William Jackson Smith
(1879 - 22 Feb 1941)
         ├─Myrtle Arbuckle
(12 Apr 1886 New Franklin, Howard County, Missouri, USA - 17 Apr 1966 Fayette, Howard County, Missouri, USA)
         ├─Mary Arbuckle
(5 Nov 1880 Estill, Howard County, Missouri, USA - 28 Jan 1972 Marshall, Saline County, Missouri, USA)
         │ + Charles Fisher Barron
(2 Mar 1880 Howard County, Missouri, USA - 24 Sep 1955 Cape Girardeau, Cape Girardeau County, Missouri, USA)
         ├─Elizabeth (Bettie) Arbuckle
(Aug 1888 Howard County, Missouri, USA - ??)
         │ + Earnest R Long
(1881 Missouri, USA - 1965 bur.Fayette, Howard County, Missouri, USA)
         ├─Rightie Arbuckle
(28 Feb 1892 Howard County, Missouri, USA - 26 Jul 1981 Milwaukee, Milwaukee County, Wisconsin, USA)
         │ + Otha Francis Revercomb
(3 Sep 1883 Shelby County, Missouri, USA - 1955 bur.Hunnewell, Shelby County, Missouri, USA)
         └─Virginia Arbuckle
(Dec 1895 Howard County, Missouri, USA - ??)