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":
Duncan AINSWORTH
(Between 1910 and 1913 Saskatchewan, Canada - Abt 1998 Kamloops, British Columbia, Canada)
Betty Elizabeth WILLOUGHBY
(14 Jan 1921 New Westminster, British Columbia, Canada - 1986 Kamloops, British Columbia, Canada)
         └─Corinne Mabel AINSWORTH
(8 Feb 1944 New Westminster, British Columbia, Canada - 27 Jun 2020 Spences Bridge, British Columbia, Canada)