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":
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┌──Azre (Ezra) Horton
(Betw 1809 and 1821 SC or TN, USA - Bef 1887 Fannin County, Texas, USA)
┌──John Henry Horton
(14 Oct 1840 Tennessee, USA - 8 Jun 1912 Quanah, Hardeman County, Texas, USA)
│ └──Sarah Hamby
(Betw 1810 and 1821 Tennessee, USA - Abt 1871 Colbert County, Alabama, USA)
│
┌──Edgar Lee Horton
(6 Sep 1876 Farmersville, Collin County, Texas, USA - 30 Sep 1961 Quanah, Hardeman County, Texas, USA)
│ └──Mary Carolyn Wilson
(7 Apr 1844 Polk County, Arkansas, USA - 22 Feb 1946 Quanah, Hardeman County, Texas, USA)
│
Gretta May Horton (Quanah, Hardeman County, Texas, USA;24 Jun 1922 - 9 Apr 2007)
└──Nannie Bell Brannon
(4 Jul 1880 Dallas, Dallas County, Texas, USA - 17 Sep 1940 Quanah, Hardeman County, Texas, USA)