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":
Henry THORNE
(1888 Devon, England - 22 May 1971 Palmyra, Western Australia, Australia)
Lillian Matilda FERGUSSON (1896 Victoria, Australia - 25 Mar 1966 Fremantle, Western Australia, Australia)
└─Jessie Margaret THORNE (5 Apr 1922 Fremantle, Western Australia, Australia - 30 Oct 1997 Inglewood, Western Australia, Australia)
Raymond Oliver WALLIS (23 Aug 1920 Western Australia, Australia - 2 Jun 2003 Menora, Western Australia, Australia)(m. 1943 Perth, Western Australia, Australia)
1888 - 1971 (83 years)
Lillian Matilda FERGUSSON 
(1896 Victoria, Australia - 25 Mar 1966 Fremantle, Western Australia, Australia)