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":
Susannah FRIZZEL
(1831 Haselbury Briant, Dorset, England - Oct 1906 Blandford, Dorset, England)
Robert LYNE
(1832 Holwell, Dorset, England - Jan 1910 Wareham, Dorset, England)
(m. 1 Apr 1855 Holwell, Dorset, England)
└─Alfred William LYNE
(Apr 1860 Holwell, Dorset, England - Mar 1942 Heywood, Lancashire, England)
Alice BALL
(Abt 1861 Manchester, Lancashire, England - Oct 1901 Bury, Lancashire, England)
└─Harold LYNE
(2 Oct 1899 Bury, Lancashire, England - 14 Mar 1972 Manchester, Lancashire, England)
Mabel WRIGHT
(1930 Manchester, Lancashire, England - Oct 2021 New Houghton, Derbyshire, England)
1831 - 1906 (75 years)
Robert LYNE 
(1832 Holwell, Dorset, England - Jan 1910 Wareham, Dorset, England)