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: John MCGUCKIN
(Bef May 1813 Ireland - 1 May 1898 Philadelphia, Pennsylvania, USA)
Mother: Margaret UNKNOWN
(Abt 1824 Ireland - 25 Oct 1898 Philadelphia, Pennsylvania, USA)
Ida MCGUCKIN
(Philadelphia, Pennsylvania, USA;11 Mar 1858 - 29 Jul 1900)
John AYRE
(27 Aug 1864 Horton, Yorkshire, England - 9 Nov 1935 Philadelphia, Pennsylvania, USA)
└─Isaac Edward AYRE
(Philadelphia, Pennsylvania, USA;23 May 1891 - 26 May 1939)
Edith Hannah HILL
(17 Jun 1891 Bradford, Yorkshire, England - 26 Jan 1971 Philadelphia, Pennsylvania, USA)
└─James Edward AYRE
(Philadelphia, Pennsylvania, USA;14 Mar 1913 - 3 Jul 1965)
Henrietta Anna HAMAN
(21 May 1915 Philadelphia, Pennsylvania, USA - 28 Sep 2001 Pennsauken, Camden, New Jersey, USA)
1858 - 1900 (42 years)
Edith Hannah HILL 
(17 Jun 1891 Bradford, Yorkshire, England - 26 Jan 1971 Philadelphia, Pennsylvania, USA)