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":
Margaret Hannah ELLIS
(Tombarrora, New South Wales, Australia - 25 Feb 1944 Woonona, New South Wales, Australia)
John THOMAS
(1849 - 6 Sep 1928 Woonona, New South Wales, Australia)
└─Victor Israel THOMAS
(9 Jun 1887 Sunny Corner, New South Wales, Australia - DECEASED)
Edith Maude SARA
(23 Jun 1892 Spring Hill, New South Wales, Australia - 8 Sep 1974 Bulli, New South Wales, Australia)
└─Dulcie Mavis THOMAS
(21 Feb 1917 Wrightville, New South Wales, Australia - 25 Jul 2002)
Michele James POSETTI
(25 Feb 1910 Chilton, Victoria, Australia - 3 Jul 1986 Corrimal, New South Wales, Australia)
UNKNOWN - 1944
Edith Maude SARA 
(23 Jun 1892 Spring Hill, New South Wales, Australia - 8 Sep 1974 Bulli, New South Wales, Australia)