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: Thomas Gilbert Richmond (6 Apr 1870 Cleveland, Bradley County, Tennessee, USA - 3 Oct 1935 Cardiff, Scott County, Arkansas, USA)
:          + Living
Edith Stafford
(27 Dec 1905 Oklahoma, USA - 2 Jan 1948 Waldron, Scott County, Arkansas, USA)
         ├─Violet Marie Richmond
(8 Jan 1923 Cardiff, Scott County, Arkansas, USA - 3 Apr 1978 Alaska, USA)
         │ Robert Brantly Fonville
(15 Apr 1920 Seymour, Baylor County, Texas, USA - 22 Sep 1996 Leedey, Dewey County, Oklahoma, USA)
         │           + Living
         ├─Alma Maxine Richmond
(27 Nov 1925 Cardiff, Scott County, Arkansas, USA - 8 Sep 2008 Boerne, Kendall County, Texas, USA)
         │ Kenneth Neal Warren
(4 Aug 1920 Salt Lick, Bath County, Kentucky, USA - 18 Jan 2013 bur.Boerne, Kendall County, Texas, USA)
         │          │ + Living
         │          └─Daniel Warren
(28 Apr 1950 Dayton, Montgomery County, Ohio, USA - 31 Mar 1989 Missouri, USA)
         │           + Living
         ├─William Grady Richmond
(5 Nov 1936 Cardiff, Scott County, Arkansas, USA - 7 Jul 2013 Tulsa, Tulsa County, Oklahoma, USA)
         │ Martha Erika Stumps
(14 Jul 1934 Trier, Rhineland-Palatinate, Germany - 16 Sep 2006 Midwest City, Oklahoma County, Oklahoma, USA)