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":
Harry Ernest SAVAGE
(Apr 1868 Bosmere, Suffolk, England - 1 Aug 1944 Beverley, Western Australia, Australia)
Charlotte Sarah Webb BISHOP (7 Jul 1871 York, Western Australia, Australia - 13 May 1927 Perth, Western Australia, Australia)
└─Mary Madge SAVAGE (Beverley, Western Australia, Australia;1897 - 28 Dec 1983)
Herbert CARR (3 Feb 1897 York, Western Australia, Australia - 31 May 1972 Beverley, Western Australia, Australia)
└─Kevin CARR (28 Jun 1928 Beverley, Western Australia, Australia - 18 Jan 2006 Rockingham, Western Australia, Australia)
1868 - 1944 (~ 76 years)
Charlotte Sarah Webb BISHOP 
(7 Jul 1871 York, Western Australia, Australia -