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":
Samuel RUSSELL
(Abt 1804 - 29 Apr 1853 White Hills, Victoria, Australia)
Mary Ann MARTIN (29 Oct 1821 Tasmania, Australia - 27 Aug 1902 North Melbourne, Victoria, Australia)
└─William RUSSELL (1852 Westernport, Victoria, Australia - 1926 Woomelang, Victoria, Australia)
Mary Ann DAVIS (Abt 1863 - 1943 Sea Lake, Victoria, Australia)
└─William Vincent RUSSELL (1892 Footscray, Victoria, Australia - 1957 Birchip, Victoria, Australia)
Mary SHEPHERD (8 Dec 1896 Charlton, Victoria, Australia - 9 Jan 1983 Sea Lake, Victoria, Australia)
└─William Clifford RUSSELL (12 Nov 1926 Woomelang, Victoria, Australia - 4 Dec 2012 Mildura, Victoria, Australia)
Jean Elizabeth DONNAN (9 Aug 1927 Watchupga, Victoria, Australia - 13 Feb 2018 Swan Hill, Victoria, Australia)(m. 29 Jan 1949 Ballarat, Victoria, Australia)
Abt 1804 - 1853 (~ 49 years)
Mary Ann MARTIN 
(29 Oct 1821 Tasmania, Australia - 27 Aug 1902 North Melbourne, Victoria, Australia)