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":
Harriet E McSpadden
(13 Jun 1846 Jefferson County, Tennessee, USA - 2 Aug 1921 bur.Dandridge, Jefferson County, Tennessee, USA)
William Wirt Blackburn
(9 Apr 1838 Jefferson County, Tennessee, USA - 31 Dec 1915 Dandridge, Jefferson County, Tennessee, USA)
         ├─William Wallace Blackburn
(15 Nov 1869 Jefferson County, Tennessee, USA - 24 Dec 1927 Jackson County, Tennessee, USA)
         │ + Ida Adaline Harrison
(Jefferson County, Tennessee, USA;22 Nov 1872 - 23 Nov 1942)
         └─Benjamin Rufus Blackburn
(10 May 1871 Jefferson County, Tennessee, USA - 16 Aug 1959 Houston, Harris County, Texas, USA)
          Effie May Yarbrough
(23 Mar 1881 Texas, USA - 5 Jan 1967 Houston, Harris County, Texas, USA)
                   ├─Hattie Pearl Blackburn
(24 Jun 1902 Liberty County, Texas, USA - 4 Aug 1997 Houston, Harris County, Texas, USA)
                   │ + Stephan Anthony Kappe
(15 Aug 1894 Bryan, Brazos County, Texas, USA - 2 Nov 1968 Houston, Harris County, Texas, USA)
                   ├─William Charles Blackburn
(Abt 1906 Liberty County, Texas, USA - ??)
                   ├─Benjamin Rufus Blackburn, Jr
(24 May 1908 Liberty County, Texas, USA - 2 Aug 1996 New Caney, Montgomery County, Texas, USA)
                   │ Elois Fay Ramsay
(24 May 1909 Gonzales County, Texas, USA - 6 Mar 2008 New Caney, Montgomery County, Texas, USA)
                   ├─Joseph Lawrence Blackburn
(25 May 1913 Houston Heights, Harris County, Texas, USA -                    │ 18 Sep 1989 Houston, Harris County, Texas, USA)
                   └─Clifford Wesley Blackburn
(Houston, Harris County, Texas, USA;25 Dec 1918 - 22 May 1935)