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":
Esther Helen MURRAY
(21 Jul 1884 Laura, South Australia, Australia - DECEASED Beverley, Western Australia, Australia)
Roderick Conrad SMITH (5 Dec 1889 York, Western Australia, Australia - 16 Jul 1976 Beverley, Western Australia, Australia)
└─Oswald Samual SMITH (5 Aug 1921 Beverley, Western Australia, Australia - 3 May 1987 Stoneville, Western Australia, Australia)
Beryl Joan PETCHELL (29 Mar 1929 Beverley, Western Australia, Australia - 17 Sep 2003 Darlington, Western Australia, Australia)(m. 15 Oct 1947 Beverley, Western Australia, Australia)
1884 - DECEASED
Roderick Conrad SMITH 
(5 Dec 1889 York, Western Australia, Australia -