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":
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┌──James Harvey Arbuckle
(17 Nov 1775 Fort Donaldson, Greenbrier County, West Virginia, USA - │ 7 Mar 1869 Greenbrier County, West Virginia, USA) =>
┌──James Harvey Arbuckle, Jr
(Lewisburg, Greenbrier County, West Virginia, USA;1 Jan 1818 - 3 Apr 1898)
│ └──Catherine Alexander
(20 Sep 1781 Augusta County, Virginia, USA - 21 Jan 1863 West Virginia, USA)
│
┌──John William Arbuckle
(Greenbrier County, West Virginia, USA;26 Apr 1850 - 30 Jan 1925)
│ └──Mahala Frances McPherson
(27 Jul 1821 Fauquier County, Virginia, USA - 18 Feb 1908 Old Fields, Hardy County, West Virginia, USA)
│
John Tate Arbuckle (10 May 1884 Lewisburg, Greenbrier County, West Virginia, USA - 18 Oct 1950 Raleigh County, West Virginia, USA)
└──Mary Tate Finley
(1 Sep 1855 Augusta County, Virginia, USA - 13 May 1884 Lewisburg, Greenbrier County, West Virginia, USA)