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":
Jessie Souper BROUN
(22 Jun 1842 Perth, Western Australia, Australia - 14 Dec 1873 Beverley, Western Australia, Australia)
John Edward SEWELL (31 Jul 1841 Northam, Western Australia, Australia - 18 Dec 1909 Pingelly, Western Australia, Australia)(m. 1873 Beverley, Western Australia, Australia)
└─Arthur Edward SEWELL (2 Dec 1873 York, Western Australia, Australia - 28 Aug 1955)
Jane Amelia ROBINSON (30 Apr 1883 Norfolk, England - 2 Sep 1968)
(m. 19 May 1903 Pingelly, Western Australia, Australia)
└─Rita May SEWELL (16 Aug 1904 Pingelly, Western Australia, Australia - Aug 1998)
Selby Avon FORD (19 Dec 1900 Beverley, Western Australia, Australia - 15 Jul 1963)
(m. 6 Oct 1933 Perth, Western Australia, Australia)
1842 - 1873 (31 years)
John Edward SEWELL 
(31 Jul 1841 Northam, Western Australia, Australia -