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: George READ
(26 May 1787 Gillingham, Dorset, England - 13 Mar 1875 Perth, Western Australia, Australia)
Mother: Elizabeth COWARD
(1782 Gillingham, Dorset, England - 22 Oct 1857 Perth, Western Australia, Australia)
Ethel READ
(24 May 1817 Gillingham, Dorset, England - 4 Dec 1887 Perth, Western Australia, Australia)
Edmund John STIRLING
(15 Aug 1815 Worstead, Norfolk, England - 2 Nov 1897 York, Western Australia, Australia)
         └─Amelia Elizabeth STIRLING
(Perth, Western Australia, Australia;5 Feb 1838 - 16 Apr 1887)
          + Henry Quartus DAVIS
(9 Mar 1846 Fremantle, Western Australia, Australia - 1894 Western Australia, Australia)