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":
Father: James CASS
(1818 Great Leighs, Essex, England - Jan 1902 Chelmsford, Essex, England)
Mother: Sarah RUTLEDGE
(Abt 1821 Boreham, Essex, England - Jan 1892 Chelmsford, Essex, England)
Alfred CASS
(24 Sep 1854 Little Waltham, Essex, England - 1936)
Susan JOHNSON
(15 May 1858 Chignall, Essex, England - Mar 1927 Rochford, Essex, England)
└─Eliza CASS
(Jan 1889 Chelmsford, Essex, England - Aft 1916)
Wilfred John SCHOOLING
(Oct 1885 Tottenham, Middlesex, England - 4 Apr 1916 Rochford, Essex, England)
└─John Robert SCHOOLING
(25 Jun 1916 Rochford, Essex, England - 23 Mar 1998 New Forest, Hampshire, England)
Marie Louvain May CABLE
(24 Aug 1915 Rochford, Essex, England - 6 Sep 1973 Southend-on-Sea, Essex, England)
1854 - 1936 (81 years)
Wilfred John SCHOOLING 
(Oct 1885 Tottenham, Middlesex, England - 4 Apr 1916 Rochford, Essex, England)