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":
Lily Mae MURPHY
(Jackson, Indiana, USA;13 Mar 1887 - 12 Sep 1946)
Harry Pinkerton MOORE (26 Sep 1874 Indiana, USA - 10 Oct 1953 Tiskilwa, Bureau, Illinois, USA)
└─Lina May MOORE (Tiskilwa, Bureau, Illinois, USA;16 May 1908 - 19 Sep 1955)
Roy Tracewell SMITH (24 Aug 1907 Lexington, Scott, Indiana, USA - 7 May 1990 Tiskilwa, Bureau, Illinois, USA)
└─Violet Christine SMITH (8 Aug 1931 Tiskilwa, Bureau, Illinois, USA - 27 Jan 2017 Peoria, Peoria, Illinois, USA)
Edmund Joseph SOBKOWIAK (5 Mar 1927 La Salle, La Salle, Illinois, USA - 13 Jun 2001 Spring Valley, Bureau, Illinois, USA)
1887 - 1946 (59 years)
Roy Tracewell SMITH 
(24 Aug 1907 Lexington, Scott, Indiana, USA -