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 Elizabeth SCRIVENER
(14 Oct 1897 Warragul, Victoria, Australia - 19 Jul 1970 Mount Hawthorn, Western Australia, Australia)
George Frederick Morrell HOLTOM (9 Dec 1898 Sedgley, Staffordshire, England - 15 Jun 1970 Langford, Western Australia, Australia)(m. 1922 Perth, Western Australia, Australia)
└─Frederick Thomas HOLTOM (26 Jul 1923 Perth, Western Australia, Australia - 11 Jul 1992 Shark Bay, Western Australia, Australia)
Loveday CURTIS (13 May 1925 Albany, Western Australia, Australia - 11 Nov 2006 Doubleview, Western Australia, Australia)(m. 11 Mar 1944 Perth, Western Australia, Australia)
├─Clinton HOLTOM (Western Australia, Australia;Jun 1951 - Jun 1951)
1897 - 1970 (72 years)
George Frederick Morrell HOLTOM 
(9 Dec 1898 Sedgley, Staffordshire, England -