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":
John Phillip DUERR
(8 Sep 1826 Hebsack, Rems-Murr-Kreis, Baden-Württemberg, Germany - 23 Jun 1895 Holyrood, Ellsworth, Kansas, USA)
Christina Adela ASCHBACHER
(7 Dec 1834 Baden-Württemberg, Germany - 12 Mar 1907 Holyrood, Ellsworth, Kansas, USA)
└─Mary Charlotta DURR
(25 Oct 1862 Wisconsin, USA - 17 Nov 1933 Lorraine, Ellsworth, Kansas, USA)
Byron Levi CHURCH
(26 Jan 1852 Michigan, USA - 14 Nov 1937 Lorraine, Ellsworth, Kansas, USA)
└─James Eli CHURCH
(19 Oct 1895 Holyrood, Ellsworth, Kansas, USA - 18 May 1980 Tulsa, Tulsa, Oklahoma, USA)
Ola Susan HARVILLE
(24 Dec 1895 Missouri, USA - 26 Nov 1967 Tulsa, Tulsa, Oklahoma, USA)
1826 - 1895 (68 years)
Christina Adela ASCHBACHER 
(7 Dec 1834 Baden-Württemberg, Germany - 12 Mar 1907 Holyrood, Ellsworth, Kansas, USA)