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":
Amelia CRUTCHFIELD
(Bef 1 Oct 1826 Hackney, Middlesex, England - Apr 1887 West Ham, Essex, England)
James MAPLE
(22 Jan 1818 Southwark, Surrey, England - 30 Mar 1865 West Ham, Essex, England)
└─Esther Eliza MAPLE
(Oct 1852 West Ham, Essex, England - 23 Jul 1940 Ilford, Essex, England)
George Ward CHALLIS
(11 Nov 1842 Lambeth, Surrey, England - Jul 1903 Greenwich, Kent, England)
└─Ada Mary MAPLE
(25 Jun 1875 Dulwich, Surrey, England - 20 Nov 1958 Surrey, England)
Walter Holton WARWICK
(8 Mar 1873 Swansea, Glamorgan, Wales - 10 May 1947 Folkestone, Kent, England)
└─Alan Douglas WARWICK
(30 Dec 1913 Lewisham, Kent, England - 15 Sep 1971 Weston-super-Mare, Somerset, England)
Barbara Olive BLOOMFIELD
(5 Jun 1914 Charlton, Middlesex, England - 21 Dec 2010 Woolwich, London, England)
Bef 1826 - 1887 (> 60 years)
Walter Holton WARWICK 
(8 Mar 1873 Swansea, Glamorgan, Wales - 10 May 1947 Folkestone, Kent, England)