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":
Charles Henry BRADDON
(4 Jan 1873 Southsea, Hampshire, England - 7 Apr 1934 Wagin, Western Australia, Australia)
Florence Helena HINE (1877 Melbourne, Victoria, Australia - DECEASED)(m. 8 Oct 1898 Ealing, Middlesex, England)
└─Edward Ernest BRADDON (7 Apr 1903 Brentwood. Middlesex, England - 1974 Mandurah, Western Australia, Australia)
Edna ROGERSON (1 Feb 1910 Nelson, Lancashire, England - 20 Mar 1989 Rockingham, Western Australia, Australia)(m. 1929 Perth, Western Australia, Australia)
└─John Edward BRADDON (4 Apr 1930 Claremont, Western Australia, Australia - 20 Mar 2007 Yangebup, Western Australia, Australia)
Rose Mary VESEY (14 Jun 1934 - Abt Jun 2021)(m. 3 Mar 1951 Perth, Western Australia, Australia)
1873 - 1934 (61 years)
Florence Helena HINE 
(1877 Melbourne, Victoria, Australia - DECEASED)(m. 8 Oct 1898 Ealing, Middlesex, England)