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":
Achsa Martin Hunt
(Abt 1870 Washington County, Tennessee, USA - 8 Jul 1928 Wallace, Washington County, Virginia, USA)
William Burgess Barkley, IV
(2 Dec 1862 Washington County, Tennessee, USA - 3 Aug 1931 Bristol, Sullivan County, Tennessee, USA)
         ├─Mabel Barkley
(12 Aug 1892 Washington County, Tennessee, USA - 22 May 1960 Asheville, Buncombe County, North Carolina, USA)
         ├─Clyde Franklin Barkley
(3 Sep 1893 Washington County, Tennessee, USA - 2 Feb 1973 Asheville, Buncombe County, North Carolina, USA)
         ├─Anna J Barkley
(Dec 1895 Washington County, Tennessee, USA - ??)
         ├─Edna Barkley
(3 May 1898 Telford, Washington County, Tennessee, USA - 12 Oct 1941 Jefferson County, Kentucky, USA)
         ├─William Ingersol Barkley
(13 Aug 1900 Wallace, Washington County, Virginia, USA - Jan 1984 Columbia, Howard County, Maryland, USA)
         │ Rachel Celia Gibson
(28 Nov 1899 West Virginia, USA - May 1987 Columbia, Howard County, Maryland, USA)