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: Luke Calvin\Colvin (20 Mar 1771 Hampshire County, Virginia - 04 Nov 1846 Hardin County, Kentucky)
Mother: Susannah J. Samuels (Abt 1773 Kentucky - 11 Mar 1830 Hardin County, Kentucky)
Elizabeth Calvin
(Hardin County, Kentucky;18 Mar 1807 - 04 Jan 1879)
Greenberry Miller (Hardin County, Kentucky;29 Aug 1805 - 23 Dec 1883)(m. 13 Sep 1831 Hardin County, Kentucky)
   ├─William Harvey Miller (14 Nov 1834 Kentucky - 19 Jan 1916 Navarro County, Texas)
   │ Vitula Abigaile Lewis (07 Aug 1848 Cloverport, Breckenridge County, Kentucky -    │ 10 Aug 1935 Kerens, Navarro County, Texas)(m. 14 Sep 1871 Meade County, Kentucky)
   │    ├─Agnes May Miller (09 Aug 1873 - 1950)
   │    ├─Annie Lee Miller (09 Mar 1874 - 11 Jul 1944)
   │    │ + Victor Hardeman ( - 1936 Junction, Texas)
   │    ├─Edd Thomas Miller (09 Mar 1876 - 1956)
   │    ├─William Lewis Miller (01 Feb 1878 - 04 Nov 1947)
   │    ├─Elizabeth Miller (08 May 1881 - 1954)
   │    ├─Luke Miller (20 Apr 1883 - 1950)
   │    └─Benjamin Miller (01 Aug 1886 - 1950)