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":
Vera Elpha James
(Douglas County, Oregon, USA;20 Nov 1892 - 19 Dec 1982)
John Ganaway Bacon
(11 May 1885 Parrottsville, Cocke County, Tennessee, USA - 1 Mar 1971 Wilbur, Douglas County, Oregon, USA)
├─John 'Gerald' Bacon
(Umpqua, Douglas County, Oregon, USA;24 Mar 1919 - 11 Mar 2015)
│ Doris Louise Haines
(8 Jun 1922 Drain, Douglas County, Oregon, USA - 24 Mar 2001 Roseburg, Douglas County, Oregon, USA)
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1892 - 1982 (90 years)
John Ganaway Bacon 
(11 May 1885 Parrottsville, Cocke County, Tennessee, USA - 1 Mar 1971 Wilbur, Douglas County, Oregon, USA)