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":
Hannah OGDEN
(27 May 1849 Keighley, Yorkshire, England - Bef 1930 Jamestown, Chautauqua, New York, USA)
Dan Bracewell SHARP
(Abt 1850 Keighley, Yorkshire, England - Nov 1886 Jamestown, Chautauqua, New York, USA)
(m. 8 Apr 1871 Oakworth, Yorkshire, England)
├─Henry SHARP
(Abt 1872 Keighley, Yorkshire, England - DECEASED)
└─Elizabeth SHARP
(Jul 1878 Keighley, Yorkshire, England - DECEASED)
Albert Edward APPLEYARD
(9 Aug 1874 New York, USA - 22 Dec 1951 Jamestown, Chautauqua, New York, USA)(m. Abt 1909 USA)
└─John Sharp APPLEYARD
(24 Jan 1910 New York, USA - 8 Mar 2000 Plainville, Hartford, Connecticut, USA)
Marion L LEWIS
(21 Apr 1917 New York, USA - 19 Oct 2015)
1849 - Bef 1930 (< 80 years)
Dan Bracewell SHARP 
(Abt 1850 Keighley, Yorkshire, England - Nov 1886 Jamestown, Chautauqua, New York, USA)