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":
Annie May SIMS
(20 Oct 1887 Newcastle, New South Wales, Australia - 22 Jul 1979 Perth, Western Australia, Australia)
Alphonsus Joseph LAWSON
(30 Mar 1879 Gisborne, Victoria, Australia - 14 Jun 1950 Perth, Western Australia, Australia)
└─Dorothy Mary LAWSON
(Kalgoorlie, Western Australia, Australia;24 Apr 1912 - 18 Oct 1972)
Ernest Charles EVANS
(11 Aug 1918 Geraldton, Western Australia, Australia - 11 Mar 1967 Fremantle, Western Australia, Australia)
: └─Neil Ernest EVANS
(16 Sep 1938 Kalgoorlie, Western Australia, Australia - 8 Oct 2015 Perth, Western Australia, Australia)
+ Murray HILLGROVE
(1905 Victoria, Australia - 1979 Perth, Western Australia, Australia)
1887 - 1979 (91 years)
Alphonsus Joseph LAWSON 
(30 Mar 1879 Gisborne, Victoria, Australia - 14 Jun 1950 Perth, Western Australia, Australia)