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":
William George COLMER
(22 Mar 1867 Clarendon, South Australia, Australia - 23 Nov 1946 Esperance, Western Australia, Australia)
Agnes Mercy JAMES (8 Jun 1872 Belair, South Australia, Australia - 5 Nov 1943 East Coolgardie, Western Australia, Australia)(m. 17 Jul 1894 Coromandel Valley, South Australia, Australia)
└─Elizabeth Elsie COLMER (14 May 1895 Coromandel Valley, South Australia, Australia - 16 Mar 1956 Esperance, Western Australia, Australia)
Albert Edward ROSEWARNE (Abt 1881 Eaglehawk, Victoria, Australia - 17 May 1958 Perth, Western Australia, Australia)(m. 1915 Kamballie, Western Australia, Australia)
└─George Frederick ROSEWARNE (2 Jan 1918 Boulder, Western Australia, Australia - 6 Jun 1998 Bunbury, Western Australia, Australia)
1867 - 1946 (79 years)
Agnes Mercy JAMES 
(8 Jun 1872 Belair, South Australia, Australia - 5 Nov 1943 East Coolgardie, Western Australia, 