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":
Mary Catherine O'Bryan
(13 Jul 1837 Missouri, USA - 4 May 1927 London, Madison County, Ohio, USA)
James A Arbuckle
(Madison County, Ohio, USA;9 Sep 1824 - 29 Jan 1901)
         ├─Albert Perry Arbuckle
(1861 Missouri, USA - 1936 bur.Madison County, Ohio, USA)
         │ + Rosa M Quimby
(Abt 1868 Vermont, USA - ??)
         ├─Charles Edwin Arbuckle
(7 May 1855 Missouri, USA - 18 Apr 1934 London, Madison County, Ohio, USA)
         ├─Emma Laura Arbuckle
(1857 Cooper County, Missouri, USA - 3 Jan 1877 Madison County, Ohio, USA)
         ├─Delia Arbuckle
(23 Dec 1859 Missouri, USA - 14 Dec 1894 Madison County, Ohio, USA)
         │ + Albert G Cartzdafner
(20 May 1858 Plain City, Madison County, Ohio, USA - 9 Oct 1942 Upper Arlington, Franklin County, Ohio, USA)
         ├─Jordan T Arbuckle
(1863 - 1865 Madison County, Ohio, USA)
         └─Julia P Arbuckle
(Missouri, USA;1858 - 1859)