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":
Alice Alma Ladd
(22 Aug 1890 Fort Worth, Tarrant County, Texas, USA - 19 Dec 1968 Jacksboro, Jack County, Texas, USA)
Mack Arthur Byars
(6 May 1890 Wilbarger County, Texas, USA - 18 Dec 1972 Vernon, Wilbarger County, Texas, USA)
└─Arthur Dean Byars
(15 Jan 1926 Vernon, Wilbarger County, Texas, USA - 29 Mar 2002 Wilbarger County, Texas, USA)
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1890 - 1968 (78 years)
Mack Arthur Byars 
(6 May 1890 Wilbarger County, Texas, USA - 18 Dec 1972 Vernon, Wilbarger County, Texas, USA)