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":
Violet May COCKRILL
(16 Feb 1895 Gorleston, Suffolk, England - 10 Oct 1972 East Retford, Nottinghamshire, England)
Edward WATSON (2 Apr 1888 Ormesby St Margaret, Norfolk, England - 2 Nov 1953 Retford, Nottinghamshire, England)
(m. 1917 Yarmouth, Norfolk, England)
└─Edward Arthur Sydney WATSON (24 Apr 1918 Yarmouth, Norfolk, England - 15 Sep 1995 Albany, Western Australia, Australia)
Marjorie Irene TRETT (3 Dec 1917 Gorleston, Suffolk, England - 22 Feb 2018 Albany, Western Australia, Australia)(m. Jan 1937 Yarmouth, Norfolk, England)
1895 - 1972 (77 years)
Edward WATSON 
(2 Apr 1888 Ormesby St Margaret, Norfolk, England - 2 Nov 1953 Retford, Nottinghamshire, England)
