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 Elizabeth HADFIELD
(13 Jul 1882 Glossop, Derbyshire, England - 6 Oct 1979 Ogden, Weber, Utah, USA)
William Cotton BETTERIDGE
(6 Apr 1881 Grouse Creek, Box Elder, Utah, USA - 12 Oct 1966 Ogden, Weber, Utah, USA)
└─Clara Hadfield BETTERIDGE
(3 Jun 1919 Grouse Creek, Box Elder, Utah, USA - 12 Feb 2011 Cedar City, Iron, Utah, USA)
Don Ririe WHEELWRIGHT
(15 Nov 1916 Ogden, Weber, Utah, USA - 25 Nov 2006 Cedar City, Iron, Utah, USA)
1882 - 1979 (97 years)
William Cotton BETTERIDGE 
(6 Apr 1881 Grouse Creek, Box Elder, Utah, USA - 12 Oct 1966 Ogden, Weber, Utah, USA)