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: Thomas Frederick CAIN (15 Aug 1858 Port Macquarie, New South Wales, Australia - 24 Nov 1910 Roma, Queensland, Australia)
Mother: Annie Maria MEEKE (19 Nov 1863 Fitzroy, Victoria, Australia - 8 Dec 1913 Roma, Queensland, Australia)
Grace Blanche CAIN
(6 Aug 1900 Roma, Queensland, Australia - 24 Jun 1991 Brisbane, Queensland, Australia)
James Alfred RAMSAY (6 Aug 1887 Orange, New South Wales, Australia - 14 Feb 1981 Brisbane, Queensland, Australia)
(m. 23 Jan 1919 Cunnamulla, Queensland, Australia)
   └─Rose Marion RAMSAY (4 Oct 1931 Longreach, Queensland, Australia -     26 Jul 1994 Brisbane, Queensland, Australia)
    James GRAHAM (27 Oct 1932 Townsville, Queensland, Australia - 18 Jun 1991 Brisbane, Queensland, Australia)
    (m. 19 Jan 1952 Brisbane, Queensland, Australia)