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":
Rosannah Johnson
(10 Mar 1816 Dutch Valley, Anderson County, Tennessee, USA - 25 Jun 1866 Anderson County, Tennessee, USA)
Samuel Keebler
(14 Feb 1820 Washington County, Tennessee, USA - 11 Dec 1899 Anderson County, Tennessee, USA)
         │ + John F. Powers
(Feb 1848 Monroe County, Kentucky, USA - 1928)
         ├─Wilburn Keebler
(13 Jul 1848 Anderson County, Tennessee, USA - 9 Jun 1908 Washington County, Tennessee, USA)
         │ Julia Alice Crouch
(28 Oct 1856 Washington County, Tennessee, USA - 24 Apr 1929 Knoxville, Knox County, Tennessee, USA)
         │          ├─Haws Augustus Keebler
(22 Aug 1877 Anderson County, Tennessee, USA - 18 Jul 1915 Los Angeles County, California, USA)
         │          │ + Daisy M ??
(May 1880 Tennessee, USA - ??)
         │          ├─William Edward Keebler
(14 Jun 1888 Anderson County, Tennessee, USA - 1 Aug 1963 Omaha, Douglas County, Nebraska, USA)
         │          ├─Elizabeth Keebler
(Feb 1881 Tennessee, USA - ??)
         │          └─Glennah Anna Keebler
(19 Aug 1884 Johnson City, Washington County, Tennessee, USA -          │           1 Jun 1954 Port Angeles, Clallam County, Washington, USA)
         │           Roy Gerome Fisher
(21 Nov 1882 Rheatown, Greene County, Tennessee, USA - 1 Nov 1976 Tacoma, Pierce County, Washington, USA)
         │                    ├─Delmas William Fisher
(11 Apr 1907 Johnson City, Washington County, Tennessee, USA -          │                    │ 22 Oct 1961 Los Angeles, Los Angeles County, California, USA)
         │                    └─Ruby Ann Fisher
(1909 Tennessee, USA - ??)
         │                     Philo Clarence Tyler
(28 Jun 1908 Boise, Ada County, Idaho, USA - 10 Jul 1979 Tacoma, Pierce County, Washington, USA)
         └─John Smallwood Keebler
(11 Jan 1851 Anderson County, Tennessee, USA - 1 Sep 1931 Asheville, Buncombe County, North Carolina, USA)
          Laura A Tadlock
(18 May 1858 Tennessee, USA - 30 Jun 1935 Knoxville, Knox County, Tennessee, USA)
                   ├─Samuel Taylor Keebler
(29 Jun 1882 Oliver Springs, Roane County, Tennessee, USA - 18 Jan 1959 Fulton County, Georgia, USA)
                   │ Idellette Mamie Queener
(26 Oct 1884 Coal Creek, Anderson County, Tennessee, USA - 22 Jun 1968 DeKalb County, Georgia, USA)
                   │          └─Eloise Claire Keebler
(1 Dec 1907 Knoxville, Knox County, Tennessee, USA -                    │           27 Oct 2000 Signal Mountain, Hamilton County, Tennessee, USA)
                   └─Eddie Pilkington Keebler
(10 Sep 1887 Oliver Springs, Roane County, Tennessee, USA -                     31 Jul 1968 Talladega, Talladega County, Alabama, USA)