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":
William Thomas DEACON
(30 Jan 1869 Coads Green, Cornwall, England - 24 Apr 1941 Velasco, Brazoria, Texas, USA)
Willi Martin WELDON (8 Aug 1878 Kentucky, USA - 1968 Freeport, Brazoria, Texas, USA)(m. 1896)
└─Dora DEACON (Abt 1900 Texas, USA - DECEASED Freeport, Brazoria, Texas, USA)
Marcus Antonious LOWE (29 Nov 1890 Lampasas, Texas, USA - 27 Jun 1940 Houston, Harris, Texas, USA)
(m. 18 Jul 1916 Brazoria, Texas, USA)
└─Marcus Antonious LOWE (31 Dec 1925 Richmond, Fort Bend, Texas, USA - 5 Apr 1981 Houston, Harris, Texas, USA)
Bettye ANSLEY (18 Jan 1926 Wharton, Texas, USA - 5 Apr 1992 Houston, Harris, Texas, USA)
(m. 8 Sep 1945)
1869 - 1941 (72 years)
Marcus Antonious LOWE 
(29 Nov 1890 Lampasas, Texas, USA - 27 Jun 1940 Houston, Harris, Texas, USA)
