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":
John M. COUCH
(1877 Georgia, USA - 2 Jan 1936 Murray, Georgia, USA)
Georgia Savannah NALLEY
(Mar 1876 Carroll, Georgia, USA - 13 Sep 1936 Carrollton, Carroll, Georgia, USA)
└─Jessie L COUCH
(23 Apr 1904 Georgia, USA - 22 Jul 1973 Villa Rica, Carroll, Georgia, USA)
Claude Jasper LOVELL
(18 Jul 1902 Carroll, Georgia, USA - 19 Jun 1970 Villa Rica, Carroll, Georgia, USA)
└─William Paul LOVELL
(Villa Rica, Carroll, Georgia, USA;27 Aug 1921 - 13 Dec 2002)
Gordie Mae BLALOCK
(29 May 1921 Carroll, Georgia, USA - 22 Dec 2013 Villa Rica, Carroll, Georgia, USA)
1877 - 1936 (59 years)
Georgia Savannah NALLEY 
(Mar 1876 Carroll, Georgia, USA - 13 Sep 1936 Carrollton, Carroll, Georgia, USA)