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":
John T Buford
(Abt 1847 Tennessee, USA - 1905 bur.Greenville, Hunt County, Texas, USA)
         ├─Edwin Kuykendall Buford
(1 Oct 1869 Cocke County, Tennessee, USA - 29 Dec 1960 Breckenridge, Stephens County, Texas, USA)
         │ + Sarah Chattie Savage
(8 Mar 1873 Monroe County, Kentucky, USA - 20 Apr 1960 Breckenridge, Stephens County, Texas, USA)
         ├─William Buford
(Abt 1873 Tennessee, USA - ??)
         ├─Sarah Buford
(Abt 1875 Tennessee, USA - ??)
         ├─May Butler
(20 Apr 1877 Tennessee, USA - 13 Dec 1956 Peniel, Hunt County, Texas, USA)
         │ + Emmett Lee Butler
(25 Jun 1870 Mississippi, USA - 11 Mar 1946 Peniel, Hunt County, Texas, USA)
         ├─Katie Belle Buford
(22 Feb 1879 Cookeville, Putnam County, Tennessee, USA - 18 Oct 1953 Mexia, Limestone County, Texas, USA)
         ├─Talton Joseph Buford
(27 Oct 1880 Tennessee, USA - 27 Aug 1957 Fresno, Fresno County, California, USA)
         ├─Anne Dora Buford
(25 Jun 1883 Texas, USA - 3 Mar 1974 Whitewright, Grayson County, Texas, USA)
         └─Alice Mary Buford
(Nov 1886 Texas, USA - Oct 1921 Sulphur, Murray County, Oklahoma, USA)
          + Oscar Wilburn Montgomery
(10 Jan 1879 Webster County, Georgia, USA - 1955 bur.Greenville, Hunt County, Texas, USA)