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":
Mary E Worthington
(27 May 1849 Ninemile, Bledsoe County, Tennessee, USA - 1 Apr 1890 Bledsoe County, Tennessee, USA)
Leander Travis Billingsley
(20 Oct 1843 Bledsoe County, Tennessee, USA - 12 Jun 1927 Billingsley, Bledsoe County, Tennessee, USA)
         ├─John Marshall Billingsley
(10 Nov 1879 Bledsoe County, Tennessee, USA - 24 Nov 1956 Chattanooga, Hamilton County, Tennessee, USA)
         ├─Flora Jane Billingsley
(Abt 1877 Bledsoe County, Tennessee, USA - ??)
         ├─Samuel W. Billingsley
(Abt 1875 Bledsoe County, Tennessee, USA - 20 Dec 1898 Cuba)
         ├─Savage Lee Billingsley
(15 Aug 1886 Pikeville, Bledsoe County, Tennessee, USA - Jan 1966 Phoenix, Maricopa County, Arizona, USA)
         └─Grover Cleveland Billingsley
(27 Dec 1884 Pikeville, Bledsoe County, Tennessee, USA - 21 Nov 1944 Nashville, Davidson County, Tennessee, USA)
          + Estelle Marker
(Nashville, Davidson County, Tennessee, USA;23 Jun 1889 - 12 Jun 1921)