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: Anthonie van Drielen (Sat 15 juli 1798 Vlissingen (NL) - Bef 5 Sep 1865 onbekend)
   │    │    ├─Nina M Holliday (1919 NV (USA) - ??)
   │    │    ├─Harry Ripley Holliday (Sat 17 Jun 1922 Ogden, UT (USA) - Fri 3 Jul 1987)
   │    │    ├─Piercy Holliday (1924 CA (USA) - ??)
   │    │    ├─Aline Holliday (1925 UT (USA) - ??)
   │    │    ├─Theodore Mapes Holliday (Sun 22 Aug 1926 Lassen, CA (USA) -    │    │    │ Fri 12 Feb 1965 Los Angeles, CA (USA))
   │    │    └─Caroline Holliday (1929 UT (USA) - ??)
   │    └─Harry S van Drielen (Tue 7 Jan 1902 Elko, NV (USA) - Fri 9 Jan 1976 Portola, CA (USA))
   └─Mary van Drielen (Tue 12 Mar 1867 CA (USA) - Wed 12 May 1943 Los Angeles, CA (USA))
    + James Spencer Stauts (Thu 13 Apr 1854 Philadelphia, PA (USA) - Mon 11 Mar 1929)
    (m. Wed 20 Nov 1889 Elko, NV (USA))