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":
Mary Ann JONES
(9 Nov 1878 Lambton, New South Wales, Australia - 25 Nov 1963 Collie, Western Australia, Australia)
John Henry Lewis MCLAREN (1876 Newcastle, New South Wales, Australia - 15 Jan 1947 Collie, Western Australia, Australia)(m. 1904 Newcastle, New South Wales, Australia)
└─Peter William MCLAREN (31 May 1906 Merewether, New South Wales, Australia - 11 Sep 1979 Collie, Western Australia, Australia)
Jessie Ida DONEGAN (3 Apr 1914 Toodyay, Western Australia, Australia - 22 Apr 1991 Perth, Western Australia, Australia)(m. 8 Jul 1933 Collie, Western Australia, Australia)
1878 - 1963 (85 years)
John Henry Lewis MCLAREN 
(1876 Newcastle, New South Wales, Australia -