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":
Mary Ann GARRATT
(1 Jan 1850 Peterborough, Northamptonshire, England - 11 Jul 1920 Perth, Western Australia, Australia)
William TRAYLEN (25 Feb 1843 Chesterton, Huntingdonshire, England - 26 Dec 1926 Guildford, Western Australia, Australia)(m. 1870 Perth, Western Australia, Australia)
└─Amy Marion TRAYLEN (Perth, Western Australia, Australia;4 Dec 1888 - 1 Sep 1965)
Henry CLEVERLY (3 Apr 1889 Toxteth Park, Lancashire, England - 11 Oct 1917 Belgium)
(m. 23 Apr 1916 Guildford, Western Australia, Australia)
└─William Harold CLEVERLY (25 Jan 1917 Guildford, Western Australia, Australia - 1997 Perth, Western Australia, Australia)
Evelyn Idreana OSBORN (13 Jan 1922 - 2015 Perth, Western Australia, Australia)
(m. 3 Jan 1942 Kalgoorlie, Western Australia, Australia)
├─Elizabeth CLEVERLY (3 Feb 1947 Kalgoorlie, Western Australia, Australia - │ 19 Oct 2004 Perth, Western Australia, Australia)
1850 - 1920 (70 years)
William TRAYLEN 
(25 Feb 1843 Chesterton, Huntingdonshire, England -