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: James Arthur HARRIS
(11 Nov 1882 Stawell, Victoria, Australia - 25 Apr 1946)
Mother: Lillian May BISHOP
(31 Aug 1887 Serpentine, Western Australia, Australia - 4 Nov 1972)
Frederick Bartholomew HARRIS
(20 Apr 1913 Fremantle, Western Australia, Australia - Between 3 and 13 Apr 1988 Western Australia, Australia)
Dora Alvina MARTIN
(13 Sep 1911 Albany, Western Australia, Australia - 24 Jul 1965 Mosman Park, Western Australia, Australia)
1913 - 1988
Dora Alvina MARTIN 
(13 Sep 1911 Albany, Western Australia, Australia - 24 Jul 1965 Mosman Park, Western Australia, Australia)