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":
Essie Faye CRELIA
(Weatherford, Parker, Texas, USA;2 Feb 1900 - 29 Jan 1960)
Lem Hershel WEST (17 Dec 1894 Cookeville, Putnam, Tennessee, USA - 23 Jun 1967 Weatherford, Parker, Texas, USA)
└─Sylvia Pearl WEST (15 May 1920 Carter, Parker, Texas, USA - 21 Dec 1980 Colleyville, Tarrant, Texas, USA)
Fred PATTERSON (12 Sep 1918 Texas, USA - 30 Jun 1965 Fort Worth, Tarrant, Texas, USA)(m. 10 Oct 1942)
└─Tim PATTERSON (16 Apr 1957 Weatherford, Parker, Texas, USA - 17 May 2016 Denton, Texas, USA)
1900 - 1960 (59 years)
Lem Hershel WEST 
(17 Dec 1894 Cookeville, Putnam, Tennessee, USA - 23 Jun 1967 Weatherford, Parker, Texas, USA)