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":
Mary Ann PASCOE
(Abt 1875 Irwin, Western Australia, Australia - 1956 Perth, Western Australia, Australia)
George William PETTIT (Nov 1885 Irwin, Western Australia, Australia - 5 Feb 1924 Geraldton, Western Australia, Australia)
└─William J. PETTIT (23 Feb 1907 Irwin, Western Australia, Australia - 29 May 1970 Perth, Western Australia, Australia)
Alice May ROSSITER (17 May 1907 Partick, Lanarkshire, Scotland - 10 Mar 1945 Perth, Western Australia, Australia)
└─Neville Frank Victor PETTIT (11 Sep 1932 Three Springs, Western Australia, Australia - Jan 2018 Perth, Western Australia, Australia)
Valma June PILL (1935 Queensland, Australia - 2022 Perth, Western Australia, Australia)
Abt 1875 - 1956 (~ 81 years)
George William PETTIT 
(Nov 1885 Irwin, Western Australia, Australia -