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":
Lowell Philipps
(17 Jan 1901 Texas, USA - 10 Feb 1961 Longview, Gregg County, Texas, USA)
Ona Bell Gillis
(29 Apr 1907 Dodson, Quay County, New Mexico, USA - 26 Oct 1998 Longview, Gregg County, Texas, USA)
└─Lowell Philipps, Jr
(Amarillo, Potter County, Texas, USA;17 May 1928 - 17 May 1928)
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1901 - 1961 (60 years)
Ona Bell Gillis 
(29 Apr 1907 Dodson, Quay County, New Mexico, USA - 26 Oct 1998 Longview, Gregg County, Texas, USA)