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":
Sarah BINNS
(Abt 1842 Cowling, Yorkshire, England - Between Oct and Dec 1910 Keighley, Yorkshire, England)
Henry DEAN
(26 Jan 1841 Glusburn, Yorkshire, England - Between Apr and Jun 1915 Skipton, Yorkshire, England)
└─Henry DEAN
(Abt 1885 Glusburn, Yorkshire, England - 13 Jul 1933 Haworth, Yorkshire, England)
Gladys Myrtle SUNDERLAND
(2 Feb 1897 Keighley, Yorkshire, England - 16 Jun 1982 Urmston, Lancashire, England)
└─Margaret Dean SUNDERAND
(8 Jan 1933 Keighley, Yorkshire, England - 20 Dec 1981 Flixton, Lancashire, England)
Abt 1842 - 1910
Henry DEAN 
(26 Jan 1841 Glusburn, Yorkshire, England - Between Apr and Jun 1915 Skipton, Yorkshire, England)