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 Jane WOODINGS
(10 Jul 1851 Thebarton, South Australia, Australia - 18 Aug 1935 Blackwood, South Australia, Australia)
George THOMPSON (8 May 1843 Liverpool Plains, New South Wales, Australia - 19 Jun 1885 Minyip, Victoria, Australia)
└─George THOMPSON (1885 Minyip, Victoria, Australia - 1974 Perth, Western Australia, Australia)
Laura Elizabeth DONOVAN (1890 Boranup, Western Australia, Australia - 13 May 1963 Kalamunda, Western Australia, Australia)(m. 1910 Busselton, Western Australia, Australia)
└─Floris Mary THOMPSON (21 Sep 1911 Margaret River, Western Australia, Australia - 17 Mar 1995 Mosman Park, Western Australia, Australia)
James Lionel SHAW (29 Apr 1903 York, Western Australia, Australia - 31 Jan 1977 Hamilton Hill, Western Australia, Australia)(m. 1 Jun 1932 Northam, Western Australia, Australia)
1851 - 1935 (84 years)
George THOMPSON 
(8 May 1843 Liverpool Plains, New South Wales, Australia -