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":
Grace BUNTER
(1857 - 1890 Dubbo, New South Wales, Australia)
Richard L CHANT (29 Nov 1858 Berrima, New South Wales, Australia - 17 Apr 1916 Fremantle, Western Australia, Australia)
└─Arthur Ernest John CHANT (27 May 1881 Albury, New South Wales, Australia - 5 May 1942 Geraldton, Western Australia, Australia)
Catherine EASTOUGH (Geraldton, Western Australia, Australia;12 Sep 1889 - 25 Dec 1962)
(m. 1909 Geraldton, Western Australia, Australia)
Joseph Thomas MCCARTNEY (31 Mar 1915 Mount Erin, Western Australia, Australia - 5 Nov 1993 Geraldton, Western Australia, Australia)(m. 1935 Nabawa, Western Australia, Australia)
1857 - 1890 (33 years)
Richard L CHANT 
(29 Nov 1858 Berrima, New South Wales, Australia -