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":
Julia Eckel
(Jefferson County, Tennessee, USA;28 Aug 1851 - 24 Jun 1921)
John Fain Blackburn
(30 Jan 1846 Jefferson County, Tennessee, USA - 19 Sep 1920 Jefferson City, Jefferson County, Tennessee, USA)
         ├─Elizabeth Jane Blackburn
(2 Sep 1873 Jefferson County, Tennessee, USA - 1 May 1960 Knoxville, Knox County, Tennessee, USA)
         ├─William Eckel Blackburn
(Jefferson County, Tennessee, USA;28 Jun 1880 - 24 Oct 1954)
         ├─Peter Samuel Blackburn
(Jefferson County, Tennessee, USA;16 Nov 1887 - 7 Jun 1950)
         ├─Norah A Blackburn
(Mar 1883 Jefferson County, Tennessee, USA - ??)
         ├─Priscillia Velma Blackburn
(Abt 1872 Jefferson County, Tennessee, USA - 29 Jun 1951 Knoxville, Knox County, Tennessee, USA)
         │ + Melvel G Sloat
(11 Jun 1863 Jefferson County, Tennessee, USA - 3 Jul 1951 Knoxville, Knox County, Tennessee, USA)
         ├─Martha Miranda Blackburn
(7 Aug 1877 Jefferson County, Tennessee, USA - 23 Dec 1943 bur.White Pine, Jefferson County, Tennessee, USA)
         │ + Joseph Portrum Newman
(Jul 1875 Jefferson County, Tennessee, USA - 4 Mar 1965 bur.White Pine, Jefferson County, Tennessee, USA)
         ├─John Blackburn
(Jefferson County, Tennessee, USA;11 Jun 1894 - 4 Dec 1899)
         ├─Julia Mae Blackburn
(Jefferson County, Tennessee, USA;27 May 1891 - 18 Jun 1894)
         └─Lucy Blackburn
(Jefferson County, Tennessee, USA;10 Jan 1886 - 8 Sep 1886)