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":
Kathleen Florence ESMONDE
(29 Sep 1890 Urana, New South Wales, Australia - 21 Apr 1962 Sydney, New South Wales, Australia)
Frederick John WATTERS
(25 Jul 1899 Yanco, New South Wales, Australia - 13 Dec 1969 Mooroopna, Victoria, Australia)
├─Phillipa Dorothea WATTERS
(24 Jun 1918 Junee, New South Wales, Australia - 21 Jun 2000 Manly, New South Wales, Australia)
│ Roy Rudd KEEN
(13 Jan 1917 Newcastle, New South Wales, Australia - 16 Aug 2004 Australia)
1890 - 1962 (71 years)
Frederick John WATTERS 
(25 Jul 1899 Yanco, New South Wales, Australia - 13 Dec 1969 Mooroopna, Victoria, Australia)