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":
Alma May HASTINGS
(20 Mar 1891 Broken Hill, New South Wales, Australia - 6 Oct 1984 Inglewood, Western Australia, Australia)
Daniel Michael DUGGAN
(1889 Melbourne, Victoria, Australia - 1978 Perth, Western Australia, Australia)
(m. 1909 York, Western Australia, Australia)
└─Nicholas Francis DUGGAN
(23 Oct 1920 Belmont, Western Australia, Australia - 27 Oct 1952 Nedlands, Western Australia, Australia)
Phyllis Emily Rose MCBRIDE
( - 11 Dec 2014 Bassendean, Western Australia, Australia)
(m. 1941 Perth, Western Australia, Australia)
1891 - 1984 (93 years)
Daniel Michael DUGGAN 
(1889 Melbourne, Victoria, Australia - 1978 Perth, Western Australia, Australia)