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":
Fredonia Penelope (Nellie) Godbold
(17 Sep 1889 Hazlehurst, Copiah County, Mississippi, USA - 27 Nov 1973 Vernon, Wilbarger County, Texas, USA)
Earnest Elmer Horton
(12 Jan 1888 Bonham, Fannin County, Texas, USA - 2 Nov 1943 Quanah, Hardeman County, Texas, USA)
         ├─Una Florence Horton
(Quanah, Hardeman County, Texas, USA;9 Feb 1909 - 11 Mar 1909)
         ├─Velma (Peggy) Louise Horton
(29 Aug 1910 Quanah, Hardeman County, Texas, USA - 24 Dec 2008 Ojai, Ventura County, California, USA)
         │ Milton Vandevere Beckett
(4 Apr 1896 Hartford, Burlington County, New Jersey, USA -          │ 29 Jan 1957 North Hollywood, Los Angeles County, California, USA)
         ├─Ernestine Etoile Horton
(10 Jun 1912 Quanah, Hardeman County, Texas, USA - 15 Jan 1981 Vernon, Wilbarger County, Texas, USA)
         │ Robert 'Lloyd' Havins
(29 Aug 1911 Ranger, Eastland County, Texas, USA - 8 Aug 2004 Wichita Falls, Wichita County, Texas, USA)
         │          │ Oma Gene Hargesheimer
(24 Nov 1937 Quanah, Hardeman County, Texas, USA - 12 Oct 1992 Amarillo, Potter County, Texas, USA)
         │          │ :          + Living
         │          │ + Joyce Kay Poe
(2 Sep 1946 Borger, Hutchinson County, Texas, USA - 20 Aug 1996 Vernon, Wilbarger County, Texas, USA)
         │          │ + Living
         │          │ Nola Mae Moore
(29 Nov 1938 Ralls, Crosby County, Texas, USA - 31 Mar 2015 Amarillo, Potter County, Texas, USA)
         │                     + Living
         ├─Eugene Elmer Horton
(Quanah, Hardeman County, Texas, USA;14 Oct 1915 - 17 Sep 2009)
         │ Neva Loy Robbins
(30 Oct 1920 Eldorado, Jackson County, Oklahoma, USA - 1 Jul 2011 Quanah, Hardeman County, Texas, USA)
         │           + Garry Lynn Holcomb
(10 Jan 1947 Texarkana, Bowie County, Texas, USA - 9 Feb 2009 Carrollton, Dallas County, Texas, USA)
         └─Edgar 'Foy' Horton
(Quanah, Hardeman County, Texas, USA;1 Aug 1917 - 2 Mar 1989)
          Nellye Ruth Becknell
(27 Aug 1916 Wilbarger County, Texas, USA - 1 Dec 1980 Quanah, Hardeman County, Texas, USA)