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: John Trot Billingsley (4 Jul 1848 Bledsoe County, Tennessee, USA - 14 Jun 1924 Tucumcari, Quay County, New Mexico, USA)
Mother: Martha Josephine Schoolfield (10 Nov 1849 Bledsoe County, Tennessee, USA - 7 Feb 1925 Pikeville, Bledsoe County, Tennessee, USA)
Andrew Estill Billingsley
(16 Oct 1876 Bledsoe County, Tennessee, USA - 1 Jan 1947 Tucumcari, Quay County, New Mexico, USA)
Daisy (Dolly) Billingsley
(Abt 1881 Bledsoe County, Tennessee, USA - 1 Jan 1936 Tucumcari, Quay County, New Mexico, USA)
         ├─Pauline Billingsley
(Abt 1903 Tennessee, USA - ??)
         ├─Martin Irene Billingsley
(26 May 1905 Pikeville, Bledsoe County, Tennessee, USA - ??)
         ├─Howard Preston Billingsley
(9 Jan 1911 Nashville, Davidson County, Tennessee, USA - Mar 1987 Mesa, Maricopa County, Arizona, USA)
         │ + Majorie Ruth Lawrence
(7 Mar 1921 Manchester, Hillsborough County, New Hampshire, USA - May 1979)
         ├─Willa Billingsley
(Abt 1913 New Mexico, USA - ??)
         ├─John Billingsley
(Abt 1916 New Mexico, USA - ??)
         └─Mattie Billingsley
(Bledsoe County, Tennessee, USA - ??)