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":
Lucy Ann Houston
(13 May 1871 Billingsley, Bledsoe County, Tennessee, USA - 23 Apr 1956 Bledsoe County, Tennessee, USA)
Leander Travis Billingsley
(20 Oct 1843 Bledsoe County, Tennessee, USA - 12 Jun 1927 Billingsley, Bledsoe County, Tennessee, USA)
         ├─William Bates Billingsley
(17 Jan 1904 Pikeville, Bledsoe County, Tennessee, USA - 16 May 1971 Dayton, Montgomery County, Ohio, USA)
         ├─Florah Ann Billingsley
(17 Mar 1906 Bledsoe County, Tennessee, USA - ??)
         ├─Charles T Billingsley
(22 Aug 1907 Pikeville, Bledsoe County, Tennessee, USA - Aug 1967)
         ├─Lola Mae Billingsley
(22 Oct 1901 Pikeville, Bledsoe County, Tennessee, USA - 10 Jul 1990 Harper, Harper County, Kansas, USA)
         │ + Thomas James Robinson Swafford
(27 Nov 1895 Davidson County, Tennessee, USA - 19 Jan 1970 Harper County, Kansas, USA)
         ├─Woodrow L Billingsley
(Pikeville, Bledsoe County, Tennessee, USA;7 Mar 1913 - 23 Feb 1955)
         ├─Lee A Billingsley
(Jun 1899 Bledsoe County, Tennessee, USA - ??)
         └─Nellie Virginia Billingsley
(17 Mar 1900 Pikeville, Bledsoe County, Tennessee, USA - ??)
          + Charles P Leslie
(Abt 1884 Indiana, USA - ??)