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: John W Stapp (Sep 1861 Mississippi, USA - ??)
Burton Stapp
(9 Aug 1891 Texas, USA - 3 May 1981 Stamford, Jones County, Texas, USA)
Lola F Buchanan
(24 Jun 1895 San Benito, Cameron County, Texas, USA - 12 May 1988 Richardson, Dallas County, Texas, USA)
         ├─Marian Bess Stapp
(28 Aug 1925 Stamford, Jones County, Texas, USA - 15 Apr 2011 Irvine, Orange County, California, USA)
         │ Donald Brady Horton
(20 Jun 1925 Denver, Denver County, Colorado, USA - 24 Mar 2015 Lake Forest, Orange County, California, USA)
         │ :         │ John Frederick Lamm
(25 Jul 1945 Madison, Dane County, Wisconsin, USA -          │ :         │ 5 Oct 2020 San Clemente, Orange County, California, USA)
         ├─John Welton (Dub) Stapp
(14 Nov 1914 Stamford, Jones County, Texas, USA -          │ 27 May 1995 bur.Restland Memorial Park, Dallas, Dallas County, Texas, USA)
         ├─Connie Stapp
(Abt 1921 Stamford, Jones County, Texas, USA - ??)