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":
Father: Albert Henry GREGORY
(2 Apr 1886 Prahran, Victoria, Australia - DECEASED)
Mother: Florence May ARESEM
(Willagee, Western Australia, Australia;19 Aug 1890 - 2 Sep 1962)
Eileen May GREGORY
(2 Nov 1908 Fremantle, Western Australia, Australia - 9 Nov 1975 Hilton Park, Western Australia, Australia)
Herbert Henry COLE
(12 Nov 1902 Kalgoorlie, Western Australia, Australia - 2006 Perth, Western Australia, Australia)(m. 28 May 1936)
└─Beatrice Joyce COLE
(29 Dec 1925 Fremantle, Western Australia, Australia - 13 Sep 1991 Sydney, New South Wales, Australia)
1908 - 1975 (67 years)
Herbert Henry COLE 
(12 Nov 1902 Kalgoorlie, Western Australia, Australia -