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":
Arthur Thomas PERHAM
(31 Mar 1874 Pontywaun, Risca, Monmouthshire, England - 11 Jul 1957 Geraldton, Western Australia, Australia)
Mary Ann MUNDAY (9 Apr 1881 Williams, Western Australia, Australia - 25 Apr 1953 Geraldton, Western Australia, Australia)(m. 17 Mar 1899 Coolgardie, Western Australia, Australia)
└─William Humphrey PERHAM (22 Feb 1910 Southern Cross, Western Australia, Australia - 9 Dec 1992 Perth, Western Australia, Australia)
Annorah Lucy Jane O'NEIL (4 Mar 1915 Geraldton, Western Australia, Australia - 6 Aug 1992 Perth, Western Australia, Australia)(m. 1 Jan 1943 Geraldton, Western Australia, Australia)
1874 - 1957 (83 years)
Mary Ann MUNDAY 
(9 Apr 1881 Williams, Western Australia, Australia -