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: William Trewhitt (Abt 1731 Craven County, North Carolina, USA - ??)
         │          ├─George Francis Truett
(1836 North Carolina, USA - 1880 South River, Carteret County, North Carolina, USA)
         │          │ Delaney Barker
(10 Nov 1838 North Carolina, USA - 1 May 1900 Carteret County, North Carolina, USA)
         │          │ :         ├─Martin George Truitt
(Aug 1873 - ??)
         │          │ :         └─Alexander Truitt
(1 Apr 1875 North Carolina, USA - 19 Apr 1962 Carteret County, North Carolina, USA) =>
         │          │ :          + Georgia Carraway
(18 Jan 1878 North Carolina, USA - 21 May 1964 Beaufort, Carteret County, North Carolina, USA)
         │          │ Lucinda Edwards
(Abt 1835 North Carolina, USA - ??)
         │          │          └─Sophie Truitt
(Abt 1865 Craven County, North Carolina, USA - ??)
         │          ├─Wiley Truitt
(Abt 1846 North Carolina, USA - ??)
         │          │ Nancy Jane Tosto
(7 Mar 1851 Newport, Carteret County, North Carolina, USA -          │          │ 10 Jun 1938 Goldsboro, Wayne County, North Carolina, USA)
         │          │          ├─Herman Jackson Truitt
(31 Jan 1889 Carritric, Carteret County, North Carolina, USA -          │          │          │ 29 Sep 1960 Virginia Beach, Virginia Beach County, Virginia, USA) =>
         │          │          │ + Elizabeth Jane (Bettie) Rogers
(7 Jan 1894 Sampson County, North Carolina, USA -          │          │          │ 6 Nov 1982 Virginia Beach, Virginia Beach County, Virginia, USA)