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":
Peter Adrian, Sr (27 Jan 1857 Iowa - 23 Mar 1939 Clear Creek Township, Keokuk County, Iowa)
   ├─Catherine Adrian (18 Nov 1881 At Home on Farm, Clear Creek Township, Keokuk County, Iowa -    │ 3 May 1956 St. Joseph Hospital, Ottumwa, Wapello County, Iowa)
   │ :   └─Berniece Peiffer (23 Sep 1901 East Pleasant Plain, Jefferson County, Iowa -    │ :    2 Dec 2002 Washington County Hospital, Washington, Washington County, Iowa)
   │ :    Carl A Vogel (12 Jul 1904 Clear Creek Township, Keokuk County, Iowa - 30 May 1989 Keota, Keokuk County,    │ :    Iowa)(m. 1 Sep 1925 Ss. Peter and Paul Catholic Church, Clear Creek Township, Keokuk County, Iowa)
   │ Michael Hammes, Sr (12 Feb 1879 Clear Creek Township, Keokuk County, Iowa - 12 Oct 1946 bur.Clear Creek    │ Township, Keokuk County, Iowa)(m. 4 Oct 1910 Ss. Peter & Paul Catholic Church, Clear Creek Township, Keokuk    │ County, Iowa)