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":
Father: Edward Blackburn (3 Jun 1780 Washington County, Virginia, USA - 1853 Jefferson County, Tennessee, USA)
         ├─Edward A Blackburn
(16 Jul 1840 Tennessee, USA - 17 Aug 1899 bur.Athens, Limestone County, Alabama, USA)
         │ Ann William Crenshaw
(22 May 1851 Limestone County, Alabama, USA - 10 Mar 1932 Athens, Limestone County, Alabama, USA)
         │          ├─Edward Morrow Blackburn
(14 Dec 1879 Limestone County, Alabama, USA - 10 Dec 1966 Athens, Limestone County, Alabama, USA)
         │          │ Mare Sullivan Calvin
(6 Aug 1882 Alabama, USA - 21 Dec 1975 Athens, Limestone County, Alabama, USA)
         │          │          └─Edward Alexander Blackburn
(21 Apr 1920 Athens, Limestone County, Alabama, USA -          │          │           22 Oct 2008 Decatur, Morgan County, Alabama, USA)
         │          │           + Dorothy Jane Story
(23 Oct 1927 Birmingham, Jefferson County, Alabama, USA -          │          │           15 Jul 2006 Decatur, Morgan County, Alabama, USA)
         │          ├─John Nelson Blackburn, II
(14 Jul 1875 Athens, Limestone County, Alabama, USA -          │          │ 31 Jul 1971 Houma, Terrebonne County, Louisiana, USA)
         │          ├─Elizabeth Glenn Blackburn
(17 Feb 1878 Limestone County, Alabama, USA - 30 Nov 1961 Birmingham, Jefferson County, Alabama, USA)
         │          │ + William Leonidas Acuff
(12 Sep 1868 Bledsoe County, Tennessee, USA - 17 Jul 1963 Birmingham, Jefferson County, Alabama, USA)
         │          └─Annie Blackburn
(14 Feb 1881 Limestone County, Alabama, USA - 5 Dec 1951 Peach County, Georgia, USA)
         │           + John Washington Woolfolk
(7 May 1879 Houston County, Georgia, USA - 27 Sep 1945 Peach County, Georgia, USA)
         └─James Blackburn
(Abt 1852 Tennessee, USA - ??)