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":
Ann BOOTHBY
(1821 Horncastle, Lincolnshire, England - 21 Nov 1893 Grimsby, Lincolnshire, England)
Henry BLACKBURN (19 Nov 1816 Alford, Lincolnshire, England - 12 May 1883 Grimsby, Lincolnshire, England)
└─William BLACKBURN (1842 Horncastle, Lincolnshire, England - DECEASED)
Mary Ann GOUGE (10 Sep 1843 Plaxtol, Kent, England - 11 May 1884 Whitechapel, Middlesex, England)
└─Edward Henry BLACKBURN (30 Sep 1872 Mile End, Middlesex, England - 21 Apr 1951 Tooting, Surrey, England)
Jemima WIGGINS (10 Dec 1871 Mile End, Middlesex, England - 21 Feb 1924 Poplar, Middlesex, England)
└─Violet BLACKBURN (20 Apr 1914 London, England - 1 Mar 1999 Reading, Berkshire, England)
Harold William FOX (23 Jun 1915 Romsey, Hampshire, England - 9 May 1997 Reading, Berkshire, England)
1821 - 1893 (72 years)
Henry BLACKBURN 
(19 Nov 1816 Alford, Lincolnshire, England - 12 May 1883 Grimsby, Lincolnshire, England)