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":
Catherine ATKINSON
(18 Dec 1892 Wallsend, New South Wales, Australia - 2 Oct 1989 Kurri Kurri, New South Wales, Australia)
Jacob Alfred GREEN
(17 Mar 1897 Outtrim, Victoria, Australia - 26 May 1977 Kurri Kurri, New South Wales, Australia)
├─Robert GREEN
(Kurri Kurri, New South Wales, Australia;9 Sep 1919 - 11 Jan 1981)
├─Doris E GREEN
(Kurri Kurri, New South Wales, Australia;1922 - 1922)
├─Herbert Alfred GREEN
(Kurri Kurri, New South Wales, Australia;20 Feb 1922 - 1922)
├─Rita GREEN
(Kurri Kurri, New South Wales, Australia;28 Sep 1924 - 23 Oct 2007)
│ + John James MCMAHON
(11 Oct 1905 Abermain, New South Wales, Australia - 28 Aug 1973 Cessnock, New South Wales, Australia)
1892 - 1989 (96 years)
Jacob Alfred GREEN 
(17 Mar 1897 Outtrim, Victoria, Australia - 26 May 1977 Kurri Kurri, New South Wales, Australia)