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":
Annie Eliza Eckel
(Jun 1851 Tennessee, USA - 31 Jul 1919 Johnson City, Washington County, Tennessee, USA)
Joseph H M Blackburn
(Jan 1849 Jefferson County, Tennessee, USA - 2 Dec 1904 Knoxville, Knox County, Tennessee, USA)
         ├─Frank Eckel Blackburn
(18 Sep 1876 Jefferson County, Tennessee, USA - 7 Apr 1915 Morristown, Hamblen County, Tennessee, USA)
         │ + Dora Angivine Smith
(Mar 1883 Hamblen County, Tennessee, USA - 8 Sep 1909 Morristown, Hamblen County, Tennessee, USA)
         ├─Raymond Clinton Blackburn, Sr
(28 Mar 1879 Tennessee, USA - 7 Jun 1969 Johnson City, Washington County, Tennessee, USA)
         │ Dessa Edith Neaureth
(27 Apr 1889 Big Rapids, Mecosta County, Michigan, USA - 18 Oct 1968 Johnson City, Washington County, Tennessee, USA)
         │          ├─Ray Clinton Blackburn, Jr
(Johnson City, Washington County, Tennessee, USA;4 Jun 1910 - May 1981)
         │          │ Anna Lee Cash
(15 Nov 1910 Washington County, Tennessee, USA - 12 Aug 1997 Johnson City, Washington County, Tennessee, USA)
         │          │          ├─Barbra Ann Blackburn
(11 Oct 1934 Johnson City, Washington County, Tennessee, USA -          │          │          │ 1 Oct 2007 Damascus, Washington County, Virginia, USA)
         │          │          │ + Joseph W. Goolsby
(24 Jun 1928 Johnson City, Washington County, Tennessee, USA -          │          │          │ 26 Jun 2013 Damascus, Washington County, Virginia, USA)
         │          │           + Living
         │          ├─Ruth Neurath Blackburn
(11 Mar 1916 Johnson City, Washington County, Tennessee, USA - 21 Aug 1996)
         │          └─Harry Blackburn
(28 May 1922 Johnson City, Washington County, Tennessee, USA - 24 Apr 2010)
         │           + Living
         ├─Mary K Blackburn
(Jun 1886 Tennessee, USA - ??)
         ├─Joseph Ardra Blackburn, Sr
(8 Oct 1892 Tennessee, USA - Aug 1962)
         ├─George Cline Blackburn
(9 Sep 1894 Jefferson County, Tennessee, USA - 27 May 1937 Dodge County, Georgia, USA)
         │ Ann Rosson Templeton
(21 Dec 1898 Scotsboro, Jackson County, Alabama, USA - 20 Jul 1957 Henderson, Vance County, North Carolina, USA)
         │          ├─George Templeton Blackburn
(25 Nov 1921 Johnson City, Washington County, Tennessee, USA -          │          │ 23 Oct 2003 Henderson, Vance County, North Carolina, USA)
         │          │ + Marjoree W Silks
(5 Aug 1922 Georgia, USA - 4 Jul 1981 Henderson, Vance County, North Carolina, USA)
         │          └─Charles Franklin Blackburn
(30 Apr 1925 Cleveland, Bradley County, Tennessee, USA - 15 Oct 2013 North Carolina, USA)
         │           Living