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: Snr Thomas SAMPEY
(Between 1833 and 1835 London, England - 3 Mar 1897 Fremantle, Western Australia, Australia)
Mother: Eliza Emma HARRIS
(1843 England - 1881 Western Australia, Australia)
         ├─Muriel Dorothy Eliza SAMPEY
(1897 Victoria Park, Western Australia, Australia -          │ 1898 Perth, Western Australia, Australia)
         └─Myrtle May SAMPEY
(1899 Perth, Western Australia, Australia - DECEASED)