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 William HOGAN
(Roanoke, Botetourt, Virginia, USA;17 Mar 1881 - 4 Jan 1960)
Mother: Mary Ann CHISOM
(Roanoke, Botetourt, Virginia, USA;29 Apr 1887 - 23 Mar 1966)
George Elmer HOGAN
(Roanoke, Botetourt, Virginia, USA;8 Jun 1912 - DECEASED)
Nettie Gertrude DOSS
(30 Sep 1919 Pittsylvania, Virginia, USA - 16 Mar 2006 Roanoke, Botetourt, Virginia, USA)
├─Thomas William HOGAN
(Roanoke, Botetourt, Virginia, USA;15 Sep 1942 - 1 Mar 2019)
├─Michael Edward HOGAN
(Roanoke, Botetourt, Virginia, USA;30 Mar 1946 - 8 Oct 1973)
└─Richard Boyd HOGAN
(Roanoke, Botetourt, Virginia, USA;17 Aug 1952 - 11 Feb 1972)
1912 - DECEASED
Nettie Gertrude DOSS 
(30 Sep 1919 Pittsylvania, Virginia, USA - 16 Mar 2006 Roanoke, Botetourt, Virginia, USA)