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: James FLAVELL
(1830 - 1885 Collingwood, Victoria, Australia)
Mother: Eliza HAUGHTON
(1825 - 1902 Balmain, New South Wales, Australia)
Mary Jane FLAVELLE
(1862 Melbourne, Victoria, Australia - 26 Aug 1935 Prahan East, Victoria, Australia)
John Ryder BARFETT
(1857 Castlemaine, Victoria, Australia - 1921 Armadale, Western Australia, Australia)
└─Claude Ryder BARFETT
(1896 Armadale, Western Australia, Australia - 1976 Mandurah, Western Australia, Australia)
Ellen BATCHELOR
(7 Sep 1895 Victoria, Australia - 1986 East Fremantle, Western Australia, Australia)
├─Helen June BARFETT
(5 Nov 1923 - 1996 Joondalup, Western Australia, Australia)
│ Francis James CRAMOND
(21 Jun 1922 Australia - 1993 South Perth, Western Australia, Australia)
1862 - 1935 (73 years)
John Ryder BARFETT 
(1857 Castlemaine, Victoria, Australia - 1921 Armadale, Western Australia, Australia)