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":
Donald Gilbert USHER
(1882 Tolmie, Victoria, Australia - 1969 Perth, Western Australia, Australia)
Annie Francis STUBBS
(1883 Tongala, Victoria, Australia - 1958 Perth, Western Australia, Australia)
└─Ivy May USHER
(29 Apr 1912 Broomehill, Western Australia, Australia - 29 Mar 2003)
Sidney Frederick POTTER
(9 Oct 1909 Albany, Western Australia, Australia - 23 Nov 1978 Bridgetown, Western Australia, Australia)
1882 - 1969 (87 years)
Sidney Frederick POTTER 
(9 Oct 1909 Albany, Western Australia, Australia - 23 Nov 1978 Bridgetown, Western Australia, Australia)