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":
Marie Victoria CLEMENT
(3 Jul 1896 Harrisville, Cheshire, New Hampshire, USA - Apr 1986 Lebanon, Grafton, New Hampshire, USA)
Patrick William PATERSON (11 May 1884 Fraserburgh, Aberdeenshire, Scotland - 15 Apr 1966 Lebanon, Grafton, New Hampshire, USA)(m. 21 Jan 1922 Lebanon, Grafton, New Hampshire, USA)
└─William Norman PATERSON (20 Mar 1926 Lebanon, Grafton, New Hampshire, USA - 1 Nov 2008 White River Junction, Windsor, Vermont, USA)
Ellen Marie GRISWOLD (9 Sep 1930 Hanover, Grafton, New Hampshire, USA - 15 Jun 2013 Lebanon, Grafton, New Hampshire, USA)(m. 14 Jun 1952 Lebanon, Grafton, New Hampshire, USA)
1896 - 1986 (89 years)
Patrick William PATERSON 
(11 May 1884 Fraserburgh, Aberdeenshire, Scotland -