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":
Alice PEAK
(13 Jun 1886 Fremantle, Western Australia, Australia - 10 Feb 1959 Mount Lawley, Western Australia, Australia)
Charles Henry SMITH (4 Feb 1882 Central Cumberland, New South Wales, Australia - 22 Jan 1954 Perth, Western Australia, Australia)(m. 28 Mar 1907 Perth, Western Australia, Australia)
└─Stanley Charles SMITH (7 Oct 1911 Perth, Western Australia, Australia - 11 Jul 1958 Inglewood, Western Australia, Australia)
Gladys ELLIOTT (1918 York, Western Australia, Australia - 17 Oct 1997 Inglewood, Western Australia, Australia)(m. 1943 Perth, Western Australia, Australia)
1886 - 1959 (72 years)
Charles Henry SMITH 
(4 Feb 1882 Central Cumberland, New South Wales, Australia -