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 ENRIGHT
(1802 Kerry, Ireland - 5 Oct 1887 Northam, Western Australia, Australia)
Mother: Johanna O'CONNOR
(1806 Limerick, Ireland - 26 Jan 1897 Perth, Western Australia, Australia)
Patrick ENRIGHT
(1844 Kerry, Ireland - 24 Sep 1927 Northam, Western Australia, Australia)
Mary Angela CARROLL
(Jun 1855 York, Western Australia, Australia - 12 Jan 1887 Northam, Western Australia, Australia)
├─Patrick ENRIGHT
(12 Oct 1878 Greenhills, Western Australia, Australia - 31 May 1960 Northam, Western Australia, Australia)
├─Maurice ENRIGHT
(Northam, Western Australia, Australia;13 Mar 1885 - 1 Jan 1972)
1844 - 1927 (83 years)
Mary Angela CARROLL 
(Jun 1855 York, Western Australia, Australia - 12 Jan 1887 Northam, Western Australia, Australia)