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 Alice Phillips
(11 Nov 1876 Tennessee, USA - 1926 bur.San Bernardino County, California, USA)
George W Wattenbarger
(30 May 1871 Cleveland, Bradley County, Tennessee, USA - 9 Sep 1934 San Bernardino County, California, USA)
         ├─Clarence Lee Wattenbarger
(6 Aug 1902 Tennessee, USA - 9 Jan 1990 Fontana, San Bernardino County, California, USA)
         │ Maybelle Gluyas
(Abt 1901 California, USA - ??)
         ├─John Alvin Wattenbarger
(14 Sep 1905 San Bernardino County, California, USA - 25 May 1992 Las Vegas, Clark County, Nevada, USA)
         │ Gladys Hazel Bunnell
(19 Oct 1898 California, USA - 22 Nov 1996 Las Vegas, Clark County, Nevada, USA)
         │          └─Donald Floyd Wattenbarger
(San Bernardino County, California, USA;2 Jun 1932 - 15 Apr 1981)
         │           + Living
         ├─Edith Wattenbarger
(San Bernardino County, California, USA;1908 - Apr 1913)
         ├─Floyd William Wattenbarger
(15 Apr 1913 San Bernardino County, California, USA - 5 Mar 1984 Sun City, Riverside County, California, USA)
         └─Forrest Louis Wattenbarger
(25 Jan 1916 San Bernardino County, California, USA - 15 Nov 2005 Port Angeles, Clallam County, Washington, USA)
          + Mildred Hazell Achilles
(5 May 1915 Oklahoma City, Oklahoma County, Oklahoma, USA - 3 Jun 2003 Sun City, Riverside County, California, USA)