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":
Mary Withers Young
(Abt 1867 Augusta County, Virginia, USA - 18 Aug 1939 Greenbrier County, West Virginia, USA)
John William Arbuckle
(Greenbrier County, West Virginia, USA;26 Apr 1850 - 30 Jan 1925)
         ├─William Withers Arbuckle
(23 May 1894 Lewisburg, Greenbrier County, West Virginia, USA -          │ 6 Nov 1962 bur.Arlington, Arlington County, Virginia, USA)
         │ Margaret E MacIntosh
(9 Oct 1896 Colorado, USA - 13 Nov 1958 bur.Arlington, Arlington County, Virginia, USA)
         ├─Agnes Atkinson Arbuckle
(20 Jun 1897 Lewisburg, Greenbrier County, West Virginia, USA - 4 Apr 1926 Kanawha County, West Virginia, USA)
         │ + Joseph Crosley Jefferds, Sr
(19 Feb 1880 Washington, District of Columbia, USA - 8 Nov 1966 Charleston, Kanawha County, West Virginia, USA)
         ├─Frances McPherson Arbuckle
(28 Jan 1901 Lewisburg, Greenbrier County, West Virginia, USA - ??)
         └─Minnie Bidgood Arbuckle
(6 Aug 1906 Lewisburg, Greenbrier County, West Virginia, USA -           12 Oct 1996 Fayetteville, Fayette County, West Virginia, USA)
          + Luther James Dempsey
(9 Jan 1905 Lincoln County, West Virginia, USA - 6 May 1970 Charleston, Kanawha County, West Virginia, USA)