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":
George Robert TURNER
(10 Jul 1897 Manchester, Lancashire, England - 23 Mar 1948 Natal, South Africa)
Gladys Annie HOLMES
(1896 Stacksteads, Lancashire, England - 5 Aug 1977 Nairobi, Nairobi Area, Kenya)
├─Toni TURNER
(1918 Bacup, Lancashire, England - DECEASED)
└─Douglas Rockwood TURNER
(20 Aug 1923 Calgary, Alberta, Canada - 25 Nov 1998 Downpatrick, Down, Northern Ireland)
Dorothy Haslett CRAWFORD
(23 Jan 1923 Dublin, Ireland - 17 May 2007 Bangor, Down, Northern Ireland)
1897 - 1948 (50 years)
Gladys Annie HOLMES 
(1896 Stacksteads, Lancashire, England - 5 Aug 1977 Nairobi, Nairobi Area, Kenya)