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 BROOKS
(24 Sep 1861 Paterson, Passaic, New Jersey, USA - 1957)
Mother: Belle FERGUSON
(West Rutland, Rutland, Vermont, USA;1872 - 1963)
Grace BROOKS
(18 Apr 1904 West Rutland, Rutland, Vermont, USA - Jan 1986 Epsom, Merrimack, New Hampshire, USA)
Elroy Elijah WOOD
(11 Aug 1900 Hartland, Windsor, Vermont, USA - 1 Feb 1969 Concord, Merrimack, New Hampshire, USA)
└─Doris Margaret WOOD
(Concord, Merrimack, New Hampshire, USA;6 Nov 1926 - 22 Mar 2001)
Daniel Edward SULLIVAN
(Concord, Merrimack, New Hampshire, USA;27 Jan 1922 - 8 Nov 1998)
1904 - 1986 (81 years)
Elroy Elijah WOOD 
(11 Aug 1900 Hartland, Windsor, Vermont, USA - 1 Feb 1969 Concord, Merrimack, New Hampshire, USA)