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 Artimis Roberts
(15 Mar 1880 Brock, Parker County, Texas, USA - 12 Jul 1970 Bloomington, McLean County, Illinois, USA)
:         ├─Herbert Theadore Hutcheson
(17 Aug 1898 Weatherford, Parker County, Texas, USA - :         │ 1948 bur.East Lawn Memorial Gardens Cemetery and Mausoleum, Bloomington, McLean County, Illinois, USA)
:         │ + Mildred Viola ??
(8 Mar 1906 Illinois, USA - Nov 1987 Joliet, Will County, Illinois, USA)
:         ├─Hannissa Annabeth Hutcheson
(17 Feb 1902 Dalhart, Dallam County, Texas, USA - 19 Feb 1995 Bloomington, McLean County, Illinois, USA)
:         │ + Thomas W Freedlund
(19 May 1898 Illinois, USA - 29 Mar 1978 Bloomington, McLean County, Illinois, USA)
:         │ + Frank I Harsha
(11 Jan 1896 Illinois, USA - 2 Aug 1974 Bloomington, McLean County, Illinois, USA)
:         ├─Corrie Alda Hutcheson
(Abt 1904 Texas, USA - ??)
:         └─Lucile Hutcheson
(9 Dec 1905 Alvord, Wise County, Texas, USA - 8 Feb 1994 Bloomington, McLean County, Illinois, USA)
:          + Victor J Neirynck
(19 Sep 1903 Belgium - 28 Mar 1962 Olmsted County, Minnesota, USA)
+ Andrew J Stanger
(15 Mar 1851 Ellsworth, McLean County, Illinois, USA - 24 Jul 1935 Bloomington, McLean County, Illinois, USA)