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":
George F ROYER
(Abt 1896 Islington, Middlesex, England - DECEASED)
Evaline May GAUNT (1 Jul 1903 Leicestershire, England - 3 Jan 1988 Perth, Western Australia, Australia)
(m. 1924 Swan, Western Australia, Australia)
└─Brian Franklin ROYER (Between 1931 and 1941 Kalamunda, Western Australia, Australia - 21 Oct 1970 Morley, Western Australia, Australia)
Margaret Joan NETHERWAY (1932 Swan, Western Australia, Australia - 16 Aug 1977 Scarborough, Western Australia, Australia)(m. 1953 Swan, Western Australia, Australia)
Abt 1896 - DECEASED
Evaline May GAUNT 
(1 Jul 1903 Leicestershire, England - 3 Jan 1988 Perth, Western Australia, Australia)
