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":
Rhoda Elizabeth Boatright
(21 Aug 1867 Cleburne, Johnson County, Texas, USA - 9 Oct 1961 Big Spring, Howard County, Texas, USA)
Charles William Hutcheson
(11 Apr 1867 Meigs County, Tennessee, USA - 29 Jan 1916 Snyder, Scurry County, Texas, USA)
         ├─Ponder Hutcheson
(13 Dec 1892 Texas, USA - Jul 1976 Oklahoma City, Oklahoma County, Oklahoma, USA)
         │ + William G Roberson
(Abt 1893 Texas, USA - ??)
         │ + Robert Walker McMullan
(26 May 1892 Texas, USA - 14 May 1914 Fort Worth, Tarrant County, Texas, USA)
         ├─Daniel William Boatright (Bill) Hutcheson
(21 Sep 1895 Cleburne, Johnson County, Texas, USA -          │ 21 Sep 1958 Big Spring, Howard County, Texas, USA)
         │ Mona Sears
(8 Aug 1901 Texas, USA - 17 Sep 1971 Tucson, Pima County, Arizona, USA)
         │          ├─Daniel William Hutcheson
(Abt 1921 Texas, USA - ??)
         │          ├─Jack S Hutcheson
(1 Feb 1926 Snyder, Scurry County, Texas, USA - 24 Dec 1989 Knoxville, Knox County, Tennessee, USA)
         │          ├─Charles Sears Hutcheson
(9 Nov 1930 Woodward, Woodward County, Oklahoma, USA - 15 Sep 1946 Kermit, Winkler County, Texas, USA)
         ├─James Caswell Hutcheson, II
(25 Sep 1895 Cleburne, Johnson County, Texas, USA - 17 Mar 1976 Sabine, Van Zandt County, Texas, USA)
         │ Margaret P Wharton
(12 Jul 1906 Tennessee, USA - 28 Apr 1989 Potter County, Texas, USA)
         │          ├─James Caswell Hutcheson, Jr
(5 Feb 1923 Amarillo, Potter County, Texas, USA - 16 Aug 1993 Potter County, Texas, USA)
         │          ├─Robert Hutcheson
(Amarillo, Potter County, Texas, USA;31 Dec 1933 - 17 Oct 1997)
         ├─John Horace Hutcheson
(20 Oct 1897 Texas, USA - 9 Jun 1951 bur.Snyder, Scurry County, Texas, USA)
         │ + Agnes Emma Teters
(27 Jan 1897 Thorp Springs, Hood County, Texas, USA - 19 Feb 1953 Odessa, Ector County, Texas, USA)
         ├─Willard Naomi Hutcheson
(10 Sep 1902 New Mexico, USA - ??)
         │ + Francis (F) Monroe Carpenter
(2 Dec 1903 Texas, USA - 18 Jan 1986 Portland, San Patricio County, Texas, USA)
         │ + Addison Bruce Casstevens
(Snyder, Scurry County, Texas, USA;7 Dec 1903 - 8 Mar 1959)
         └─Glynn Carol (Pete) Hutcheson
(15 Jan 1905 Alamogordo, Otero County, New Mexico, USA - 7 May 1959 Midland, Midland County, Texas, USA)