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: Samuel NEWALL
(Abt 1886 Miles Platting, Lancashire, England - DECEASED)
Mother: Edith ELLIS
(Abt 1884 Ancoats, Lancashire, England - DECEASED)
Alice NEWALL
(6 Aug 1915 Manchester, Lancashire, England - 17 Sep 2002 Geraldton, Western Australia, Australia)
+ Kevin John BRIDGES
(22 Apr 1917 - 21 Dec 2005 bur.Mingenew, Western Australia, Australia)
Stanley Keith BRANDIS
(13 Apr 1911 Dongara, Western Australia, Australia - 23 Dec 1976 Three Springs, Western Australia, Australia)
├─Brian Keith BRANDIS
(6 Mar 1935 Three Springs, Western Australia, Australia - 26 Mar 2009 Gingin, Western Australia, Australia)
1915 - 2002 (87 years)
Stanley Keith BRANDIS 
(13 Apr 1911 Dongara, Western Australia, Australia -