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":
    Joannes Michael Ott (Ebenheid, Freudenberg, Main-Tauber-Kreis, Baden-Württemberg, Germany;17 Jan 1737 -     3 Aug 1811)(m. 21 Feb 1775 Ebenheid, Wuerttenberg, Germany)
       └─Regina Ott (11 Jan 1794 Ebenheld, Freudenberg, Main-Tauber-Kreis, Baden-Württemberg, Germany -         24 Dec 1834 Neunkirchen, Miltenberg, Unterfranken, Bavaria, Germany)
        Johann Melchior Konrad, Jr. (25 Sep 1796 Neunkirchen, Miltenberg, Unterfranken, Bavaria, Germany -         16 May 1879 Pine Bluff, Dane County, Wisconsin)(m. 14 Feb 1820 Neunkirchen, Bavaria, Germany)
           └─Catherine Conrad (20 May 1822 Neunkirchen, Bavaria, Germany -             27 Feb 1879 Clear Creek Township, Keokuk County, Iowa) =>
            + Frances Anton Lutz (15 Apr 1823 Richelbach, Neunkirchen, Miltenberg, Unterfranken, Bavaria, Germany             - 3 May 1906 Clear Creek Township, Keokuk County, Iowa)(m. 15 Apr 1845 Neunkirchen, Ansbach,             Bavaria, Germany)