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":
Legend:
Living
   └─Johann Michael Eckert (1681 Wessental, Freudenberg, Main-Tauber-Kreis, Baden-Würtemberg, Germany -     11 Mar 1761 Wessental, Freudenberg, Wertheim, Baden, Germany)
    Maria Appollonia Weimer (29 May 1685 - 1 Nov 1757 Wessental, Freudenberg, Wertheim, Baden, Germany)(m. 1707)
       └─Anna Maria Eckart (30 Aug 1716 Wessental, Freudenberg, Wertheim, Baden, Germany - ??)
        Johann Michael Engelhard (Neunkirchen, Miltenberg, Unterfranken, Bavaria, Germany; - 14 Jun 1751)
        (m. 26 Feb 1737 Neunkirchen, Miltenberg, Unterfranken, Bavaria, Germany)
           └─Maria Eva Engelhard (Neunkirchen, Miltenberg, Unterfranken, Bayern, Germany;1734 - 8 Dec 1772) =>
            + Joannes Martin Schlegel (Neunkirchen, Miltenberg, Unterfranken, Bayern, Germany;11 Nov 1741 -             22 Oct 1794)(m. 12 Feb 1765 Neunkirchen, Miltenberg, Unterfranken, Bayern, Germany)