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":
Etta Belle BENNETT
(31 Dec 1893 South Prarie, Pierce, Washington, USA - 8 Dec 1941 Modesto, Stanislaus, California, USA)
Frank Herbert CORSON (4 Feb 1895 Colusa, Colusa, California, USA - 28 Mar 1968 Walnut Creek, Contra Costa, California, USA)
└─Marcelle Viola CORSON (6 Oct 1917 Sacramento, Sacramento, California, USA - 15 Apr 2004 Carmichael, Sacramento, California, USA)
Roy Walter Goodwill LEAR (30 Jan 1915 Perth, Western Australia, Australia - 20 Aug 1997 Carmichael, Sacramento, California, USA)
1893 - 1941 (47 years)
Frank Herbert CORSON 
(4 Feb 1895 Colusa, Colusa, California, USA -