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: Andrew A Blackburn (18 May 1814 Jefferson County, Tennessee, USA - 13 Jul 1891 Suwannee County, Florida, USA)
Mother: Ellen E Dick (3 Jul 1829 Tennessee, USA - 26 Oct 1901 bur.Live Oak, Suwannee County, Florida, USA)
Henry Alonzo Blackburn
(28 Jan 1850 New Market, Jefferson County, Tennessee, USA - 12 Jul 1922 Tampa, Hillsborough County, Florida, USA)
Julia Virginia Dickinson
(7 Dec 1854 Madison County, Florida, USA - 1 Jun 1927 Tampa, Hillsborough County, Florida, USA)
         ├─Harry Dickinson Blackburn
(24 Jul 1878 Live Oak, Suwannee County, Florida, USA - Oct 1961 Dade County, Florida, USA)
         │ Mary V Wharton
(Dec 1884 Washington, District of Columbia, USA - ??)
         │          └─William Wharton Blackburn
(3 Jul 1917 Roanoke, Roanoke County, Virginia, USA -          │           27 Aug 1995 Johns Island, Charleston County, South Carolina, USA)
         │           + Elizabeth Blyth Weston Venning
(8 Aug 1919 South Carolina, USA - 21 Mar 2009 Johns Island, Charleston County, South Carolina, USA)
         ├─Charles Horace Blackburn
(24 Oct 1880 Live Oak, Suwannee County, Florida, USA - 15 Oct 1976)
         ├─Julia Eleanor Blackburn
(28 Aug 1883 Florida, USA - 22 Dec 1935 Tampa, Hillsborough County, Florida, USA)
         │ + Claude Thornton Ansley
(1 Sep 1879 Union Springs, Bullock County, Alabama, USA - 14 May 1934 Tampa, Hillsborough County, Florida, USA)
         ├─Frank Talmage Blackburn
(29 Jun 1886 Live Oak, Suwannee County, Florida, USA - 24 Feb 1962 Savannah, Chatham County, Georgia, USA)
         ├─Freddie Andrews Blackburn
(1 Apr 1889 Live Oak, Suwannee County, Florida, USA - ??)
         │ Victoria ??
(Abt 1887 Virginia, USA - ??)
         │          └─Elizabeth Blackburn
(Abt 1906 Virginia, USA - ??)
         ├─Lottie Plumley Blackburn
(7 Oct 1891 Live Oak, Suwannee County, Florida, USA - ??)
         ├─Jennie Maude Blackburn
(15 Jul 1894 Lake County, Florida, USA - 16 Jun 1987 Thomasville, Thomas County, Georgia, USA)
         │ + George Roundtree Neel
(Thomasville, Thomas County, Georgia, USA;18 Jan 1883 - 27 Nov 1973)
         └─Nellie May Blackburn
(14 Jan 1876 Suwannee County, Florida, USA -           27 Apr 1952 bur.Myrtle Hill Memorial Park, Tampa, Hillsborough County, Florida, USA)
          + William Singer Airth
(6 Sep 1849 Canada - 1 Jul 1900 Atlanta, DeKalb County, Georgia, USA)