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":
George JOHNSON
(Abt 1880 Bootham, Yorkshire, England - 19 Oct 1943 Katanning, Western Australia, Australia)
Emily Isabella BAIN (28 Jan 1892 Winninowie, South Australia, Australia - 13 Feb 1982 Katanning, Western Australia, Australia)
└─Aileen Pearl JOHNSON (1926 Katanning, Western Australia, Australia - 17 Oct 1992 Wilson, Western Australia, Australia)
Richard Alfred NEWPORT (1 Jan 1925 Katanning, Western Australia, Australia - 1989 Longreach, Queensland, Australia)
Abt 1880 - 1943 (~ 63 years)
Emily Isabella BAIN 
(28 Jan 1892 Winninowie, South Australia, Australia -