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":
Percy James ARKELL
(11 Nov 1889 Guiting Power, Gloucestershire, England - 2 Feb 1957 Mount Hawthorn, Western Australia, Australia)
Florence Mary CARRINGTON (6 May 1893 Mologa, Victoria, Australia - 2 Oct 1984 Joondanna, Western Australia, Australia)(m. 1921 Fremantle, Western Australia, Australia)
└─Peggy Mary ARKELL (2 May 1924 Fremantle, Western Australia, Australia - 6 Aug 1989 Maylands, Western Australia, Australia)
Edward ELLARD (Maylands, Western Australia, Australia;22 Feb 1921 - 17 Aug 2017)
(m. 19 Jan 1946 Perth, Western Australia, Australia)
1889 - 1957 (67 years)
Florence Mary CARRINGTON 
(6 May 1893 Mologa, Victoria, Australia -